These Yiddish books link to digitized versions on Archive.org. The original Yiddish books were digitized by the Yiddish Book Center through the Steven Spielberg Digital Yiddish Library. You can search the archive from the Yiddish Book Center’s website by clicking here.
Dray literarishe doyres: zikhroynes vegn Yidishe shriftshteler (Three Literary Generations: Memories of Yiddish Authors)
Zitron, Samuel Leib. Vilna: Sh. Shreberk, 1920
Noente un eygene fun Yaakov Dinezon biz Hirsh Glik (Near and Dear from Jacob Dineson to Hirsh Glick)
Mayzel, Nachman. New York: Yiddisher Kultur Farband, 1957
Shrayber un verk in likht fun psikhoanaliz (Writer and Work in Light of Psychoanalysis)
Sapoznikow, Gershon. Tel-Aviv: Y. L. Perets, 1969
Yaakov Dinezon: di mame tsvishn unzere klasikers, 1856-1919 (Jacob Dinezon: The Mother Among Our Classic Writers, 1856-1919)
Rozshanski, Shemu’el. Buenos-Ayres, Alveltlekhn Yidishn kultur kongres, 1956
An English translation is available here.