Cita APA (7th ed.)
Leedy, P. D. (1974). Practical research: Planning and design. Macmillan.
Cita Chicago (17th ed.)
Leedy, Paul D. Practical Research: Planning and Design. New York: Macmillan, 1974.
Cita MLA (9th ed.)
Leedy, Paul D. Practical Research: Planning and Design. Macmillan, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.