by Nicholas A. Osso ; prepared by the Adult and Vocational Education Surveys Branch of the National Center for Educational Statistics with the cooperation of the Division of Adult Education (DAE) of the Center for Adult, Vocational, Technical, and Manpower Education.
National Center for Educational Statistics. Office of Education
Washington : The Center : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1974.
Statistics Canada, Education Division, Student Information Section = Éducation permanente. Partie I, Niveau primaire-secondaire / Statistique Canada, Division de l'éducation, Section de la clientèle scolaire.