According to the MHRA Style Guide, this item should be cited in a bibliography as follows:

McIntyre, Hannah, and O'Kell, Hayley, ‘Introduction: Echo’, in Echo, ed. by Hannah McIntyre and Hayley O'Kell (= MHRA Working Papers in the Humanities, 15 (2021)), pp. 1–8, doi:10.59860/wph.a7c138d

This is how standard MHRA style would look. Some of its book series (notably Legenda) allow an alternative citation system called 'author-date', but please talk to your editor before using it. (To see the demonstration for author-date, follow this link.)

Let's take this bibliography entry one step at a time:

Step 1. We start with the name(s) of the author(s) of the article, inverting the first name into the form 'Forename, Surname'.

McIntyre, Hannah, and O'Kell, Hayley

Step 2. This is regular MHRA style, so the name's followed by a comma.

McIntyre, Hannah, and O'Kell, Hayley,

Step 3. Now we add the title, in single inverted commas. Any single quotation marks already in the title must be converted to doubles.

McIntyre, Hannah, and O'Kell, Hayley, ‘Introduction: Echo’

Step 4. We have to say where this comes from, so:

McIntyre, Hannah, and O'Kell, Hayley, ‘Introduction: Echo’, in

Step 5. Next we identify where the article is to be found, using italics, not quotation marks, for the volume title. This is actually a journal issue, but it's a themed number with a title, so we give that title here just as if it were a book.

McIntyre, Hannah, and O'Kell, Hayley, ‘Introduction: Echo’, in Echo

Step 6. After the title come any editors or translators. It's 'ed. by', not 'ed by', because although 'ed.' abbreviates 'edited', we regard the 'd' as the second letter of 'edited', not the last: so the abbreviation doesn't contain the last letter, and thus must have a full stop '.'

McIntyre, Hannah, and O'Kell, Hayley, ‘Introduction: Echo’, in Echo, ed. by Hannah McIntyre and Hayley O'Kell

Step 7. We gave this a title as if it were a book, but we need to give the equivalent journal citation as well: note the '=' sign.

McIntyre, Hannah, and O'Kell, Hayley, ‘Introduction: Echo’, in Echo, ed. by Hannah McIntyre and Hayley O'Kell (= MHRA Working Papers in the Humanities, 15 (2021))

Step 8. Now the pagination. And we use 'p.' or 'pp.' as appropriate. Journal articles used to omit 'pp.' in MHRA Style, but the Fourth Edition Guide (2024) removes this exception, so now page ranges in journals are treated just the same as in books. Number ranges are elided in the last two digits: thus '2234-2265' should be '2234-65', and '102-109' should be '102-09'.

McIntyre, Hannah, and O'Kell, Hayley, ‘Introduction: Echo’, in Echo, ed. by Hannah McIntyre and Hayley O'Kell (= MHRA Working Papers in the Humanities, 15 (2021)), pp. 1–8

Step 9. This contribution has a DOI, so the Fourth Edition Guide (2024) requires us to quote it, like so.

McIntyre, Hannah, and O'Kell, Hayley, ‘Introduction: Echo’, in Echo, ed. by Hannah McIntyre and Hayley O'Kell (= MHRA Working Papers in the Humanities, 15 (2021)), pp. 1–8, doi:10.59860/wph.a7c138d

And that's the finished bibliography entry. Note that there's no final full stop.

So how about citations in footnotes or endnotes?

In standard MHRA style, the first time the work is cited in a note, it should be cited in full. This looks very like a Bibliography entry, but:

• The author's name doesn't always come first: only for monographs. For collections and editions, the title comes first.
• Even if the author's name does come first, it's back to being the right way round, so it's Forename Surname, not Surname, Forename;
• Unlike Bibliography entries, notes are punctuated as sentences, and usually end in full stops.

Suppose we want to cite a passage on pages 24 to 27:

³⁴ See Hannah McIntyre, Hayley O'Kell, ‘Introduction: Echo’, in Echo, ed. by Hannah McIntyre and Hayley O'Kell (= MHRA Working Papers in the Humanities, 15 (2021)), pp. 1–8, doi:10.59860/wph.a7c138d, pp. 24-27.

But in any subsequent notes, a heavily abbreviated form is used:

³⁷ Compare McIntyre and O'Kell, p. 17.