Cita APA (7th ed.)

Voight, R. C. (1971). Invitation to learning: The learning center handbook. Acropolis Books.

Cita Chicago (17th ed.)

Voight, Ralph Claude. Invitation to Learning: The Learning Center Handbook. Washington: Acropolis Books, 1971.

Cita MLA (9th ed.)

Voight, Ralph Claude. Invitation to Learning: The Learning Center Handbook. Acropolis Books, 1971.