APA (7th ed.) Citation

Freedman, P. (1950). The principles of scientific research. Public Affairs Press.

Chicago Style (17th ed.) Citation

Freedman, Paul. The Principles of Scientific Research. Washington: Public Affairs Press, 1950.

MLA (9th ed.) Citation

Freedman, Paul. The Principles of Scientific Research. Public Affairs Press, 1950.

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