APA (7th ed.) Citation

Gruen, F. B. (1934). English grammar in American high schools since 1900. The Catholic university of America.

Chicago Style (17th ed.) Citation

Gruen, Ferdinand Bernard. English Grammar in American High Schools Since 1900. Washington, D.C.: The Catholic university of America, 1934.

MLA (8th ed.) Citation

Gruen, Ferdinand Bernard. English Grammar in American High Schools Since 1900. The Catholic university of America, 1934.

Warning: These citations may not always be 100% accurate.