APA

Opdycke J. B., . (1944). Take a letter, please! A cyclopedia of business and social correspondence. New York: Funk & Wagnalls.

Chicago

Opdycke John B, . 1944. Take a letter, please! A cyclopedia of business and social correspondence. New York: Funk & Wagnalls.

Harvard

Opdycke J. B., . (1944). Take a letter, please! A cyclopedia of business and social correspondence. New York: Funk & Wagnalls.

MLA

Opdycke John B, . Take a letter, please! A cyclopedia of business and social correspondence. New York: Funk & Wagnalls. 1944.