APA

Gruhn W. T., Douglass H. R., . (1956). The modern junior high school. New York: Ronald Press Co.

Chicago

Gruhn William Theodore, Douglass Harl R, . 1956. The modern junior high school. New York: Ronald Press Co.

Harvard

Gruhn W. T., Douglass H. R., . (1956). The modern junior high school. New York: Ronald Press Co.

MLA

Gruhn William Theodore, Douglass Harl R, . The modern junior high school. New York: Ronald Press Co. 1956.