Cita APA (7th ed.)

Carin, A. A., & Sund, R. B. (1989). Guided discovery activities for elementary school science (2nd ed.). Merrill.

Cita Chicago (17th ed.)

Carin, Arthur A., i Robert B. Sund. Guided Discovery Activities for Elementary School Science. 2nd ed. Columbus, Ohio: Merrill, 1989.

Cita MLA (9th ed.)

Carin, Arthur A., i Robert B. Sund. Guided Discovery Activities for Elementary School Science. 2nd ed. Merrill, 1989.