See also the home page of the Legenda book series Studies In Yiddish

ISBNSeriesExtentYearAuthorTitle
1-900755-33-5 (PB)SIY 1166pp1999ed Gennady Estraikh,
Mikhail Krutikov
Yiddish in the Contemporary World
978-1-781886-96-0 (HB)
978-1-781885-97-0 (PB)
978-1-781885-98-7 (JSTOR)
SIY 13335pp2021ed Simon Neuberg,
Diana Matut
Worlds of Old Yiddish Literature