APA (7th ed.) Citation

Praeger, R. L. (1967). An account of the Sempervivum group. J. Cramer; Stechert-Hafner Service Agency.

Chicago Style (17th ed.) Citation

Praeger, R. Lloyd. An Account of the Sempervivum Group. Lehre : New York: J. Cramer; Stechert-Hafner Service Agency, 1967.

MLA (9th ed.) Citation

Praeger, R. Lloyd. An Account of the Sempervivum Group. J. Cramer; Stechert-Hafner Service Agency, 1967.