Cite

Little blue book

MLA

Haldeman-Julius, E. (Emanuel), 1888-1951, Lear, Edward, 1812-1888. Little blue book. Undated. https://collections.library.yale.edu/catalog/10840906.

APA, 6th edition

Haldeman-Julius, E. (Emanuel), 1888-1951, & Lear, Edward, 1812-1888. (Undated)[Little blue book]. https://collections.library.yale.edu/catalog/10840906.