Cita APA (7a ed.)

Kertell, L. M., & Maslen, J. R. (2006). Bob books: Set 2, Advanced beginners. Scholastic.

Cita Chicago Style (17a ed.)

Kertell, Lynn Maslen, y John R. Maslen. Bob Books: Set 2, Advanced Beginners. New York: Scholastic, 2006.

Cita MLA (9a ed.)

Kertell, Lynn Maslen, y John R. Maslen. Bob Books: Set 2, Advanced Beginners. Scholastic, 2006.