Wengert, E. S. (1957). Case studies as tools of administrative analysis. Philippine Journal of Public Administration.
Chicago-referens (17:e uppl.)Wengert, Egbert S. "Case Studies as Tools of Administrative Analysis." Philippine Journal of Public Administration 1957.
MLA-referens (9:e uppl.)Wengert, Egbert S. "Case Studies as Tools of Administrative Analysis." Philippine Journal of Public Administration, 1957.
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