Cita APA (7th ed.)

Walsh, K. E. (2006). College writing 1. Heinle Cengage Learning.

Cita Chicago (17th ed.)

Walsh, Karen E. College Writing 1. Boston: Heinle Cengage Learning, 2006.

Cita MLA (9th ed.)

Walsh, Karen E. College Writing 1. Heinle Cengage Learning, 2006.