APA (7th ed.) Citation

Koos, L. V. (1927). The American secondary school. Ginn and Comp.

Chicago Style (17th ed.) Citation

Koos, Leonard V. The American Secondary School. Ginn and Comp, 1927.

MLA (8th ed.) Citation

Koos, Leonard V. The American Secondary School. Ginn and Comp, 1927.

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