Cita APA (7a ed.)

Eldridge, E. H. (1955). Eldridge-Good Business speller and vocabulary builder. American Book Co.

Cita Chicago Style (17a ed.)

Eldridge, Edward H. Eldridge-Good Business Speller and Vocabulary Builder. New York: American Book Co, 1955.

Cita MLA (8a ed.)

Eldridge, Edward H. Eldridge-Good Business Speller and Vocabulary Builder. American Book Co, 1955.