APA

Gruber F. C., Beatty T. B., . (1954). Secondary school activities. : McGraw-Hill.

Chicago

Gruber Frederick Charles, Beatty Thomas Bayard, . 1954. Secondary school activities. : McGraw-Hill.

Harvard

Gruber F. C., Beatty T. B., . (1954). Secondary school activities. : McGraw-Hill.

MLA

Gruber Frederick Charles, Beatty Thomas Bayard, . Secondary school activities. : McGraw-Hill. 1954.