Cita APA (7th ed.)
Leedy, P. D. (1989). Practical research: Planning and design (4th ed.). Macmillan ; Collier Macmillan.
Cita Chicago (17th ed.)
Leedy, Paul D. Practical Research: Planning and Design. 4th ed. New York : London: Macmillan ; Collier Macmillan, 1989.
Cita MLA (9th ed.)
Leedy, Paul D. Practical Research: Planning and Design. 4th ed. Macmillan ; Collier Macmillan, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.