Gaya APA

Ackoff, R, L. et al (1962). Scientific Method: Optimizing Applied Research Decisions (1 ( Pertama )). United States of America: John Wiley & Sons,Inc..

Gaya MLA

Ackoff, Russel, L.. et al. "Scientific Method: Optimizing Applied Research Decisions". 1 ( Pertama ) United States of America: John Wiley & Sons,Inc., 1962. Textbook.