Παραπομπή APA

United State. Department of Health, E. a. W. (1972). Educaton Directory.

Παραπομπή Chicago Style

United State. Department of Health, Eduaction and Welfare. Educaton Directory. Washington, 1972.

Παραπομπή MLA

United State. Department of Health, Eduaction and Welfare. Educaton Directory. 1972.