Παραπομπή APA

(1969). Directory of research, development and demonstration projects. Washington, D.C: Government Printing Office.

Παραπομπή Chicago Style

Directory of Research, Development and Demonstration Projects. Washington, D.C: Government Printing Office, 1969.

Παραπομπή MLA

Directory of Research, Development and Demonstration Projects. Washington, D.C: Government Printing Office, 1969.

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