APA (7th ed.) Citation

Freedman, P. (1949). The principles of scientific research. Macdonald.

Chicago Style (17th ed.) Citation

Freedman, Paul. The Principles of Scientific Research. London: Macdonald, 1949.

MLA (9th ed.) Citation

Freedman, Paul. The Principles of Scientific Research. Macdonald, 1949.

Warning: These citations may not always be 100% accurate.