APA (7th ed.) Citation

Perrin, P. G. (1939). An index to English: A handbook of current usage and style. Scott, Foresman and Company.

Chicago Style (17th ed.) Citation

Perrin, Porter Gale. An Index to English: A Handbook of Current Usage and Style. Chicago ; Atlanta [etc.]: Scott, Foresman and Company, 1939.

MLA (8th ed.) Citation

Perrin, Porter Gale. An Index to English: A Handbook of Current Usage and Style. Scott, Foresman and Company, 1939.