Pollack, B., & Stein, G. (1962). The collectors: Dr. Claribel and Miss Etta Cone / by Barbara Pollack. With a portrait by Gertrude Stein. Bobbs-Merrill.
Chicago-referens (17:e uppl.)Pollack, Barbara, och Gertrude Stein. The Collectors: Dr. Claribel and Miss Etta Cone / by Barbara Pollack. With a Portrait by Gertrude Stein. Indianapolis, Ind. [u.a.]: Bobbs-Merrill, 1962.
MLA-referens (8:e uppl.)Pollack, Barbara, och Gertrude Stein. The Collectors: Dr. Claribel and Miss Etta Cone / by Barbara Pollack. With a Portrait by Gertrude Stein. Bobbs-Merrill, 1962.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.