Cita APA

Johnson, D. W., Johnson, R. T., & Holubec, E. J. (1990). Circles of learning: Cooperation in the classroom (3rd ed.). Interaction Book.

Citación estilo Chicago

Johnson, David W., Roger T. Johnson, and Edythe Johnson Holubec. Circles of Learning: Cooperation in the Classroom. 3rd ed. Edina, Minn: Interaction Book, 1990.

Cita MLA

Johnson, David W., et al. Circles of Learning: Cooperation in the Classroom. 3rd ed. Interaction Book, 1990.