Cite

Little blue book

MLA

Haldeman-Julius, E. (Emanuel), 1888-1951, Sanger, Margaret,--1879-1966. Little blue book. Undated. https://collections.library.yale.edu/catalog/10799964.

APA, 6th edition

Haldeman-Julius, E. (Emanuel), 1888-1951, & Sanger, Margaret,--1879-1966. (Undated)[Little blue book]. https://collections.library.yale.edu/catalog/10799964.