APA (7th ed.) Citation

Smith, T. W. (1990). Classifying Protestant denominations. Review of religious research, 31(3), 225.

Chicago Style (17th ed.) Citation

Smith, Tom W. "Classifying Protestant Denominations." Review of Religious Research 31, no. 3 (1990): 225.

MLA (8th ed.) Citation

Smith, Tom W. "Classifying Protestant Denominations." Review of Religious Research, vol. 31, no. 3, 1990, p. 225.