Cita APA (7a ed.)

Perrin, P. G. (1968). Writer's guide and index to english. (4a. ed.). Scott, Foresman and company.

Cita Chicago Style (17a ed.)

Perrin, Poter G. Writer's Guide and Index to English. 4a. ed. Estados Unidos: Scott, Foresman and company, 1968.

Cita MLA (9a ed.)

Perrin, Poter G. Writer's Guide and Index to English. 4a. ed. Scott, Foresman and company, 1968.