Cita APA (7th ed.)

Miller, R. L., & Ehrmann, E. (1979). Hummel: The complete collector's guide and illustrated reference / by Robert L. Miller and Eric Ehrmann (2. ed.). Portfolio Pr. Corp..

Cita Chicago (17th ed.)

Miller, Robert L., i Eric Ehrmann. Hummel: The Complete Collector's Guide and Illustrated Reference / by Robert L. Miller and Eric Ehrmann. 2. ed. Huntington, NY: Portfolio Pr. Corp., 1979.

Cita MLA (8th ed.)

Miller, Robert L., i Eric Ehrmann. Hummel: The Complete Collector's Guide and Illustrated Reference / by Robert L. Miller and Eric Ehrmann. 2. ed. Portfolio Pr. Corp., 1979.