Bilignin
MLA
Stein, Gertrude, 1874-1946. Bilignin. Box 156, folder 3955-3957. n.d.. https://collections.library.yale.edu/catalog/2067805.
APA, 6th edition
Stein, Gertrude, 1874-1946. (["Box 156, folder 3955-3957"])(n.d.)[Bilignin]. https://collections.library.yale.edu/catalog/2067805.