Cita APA (7a ed.)

Feldt, R., Johnson, L., & Neumann, M. (2002). Ruby developer's guide. Syngress Pub..

Cita Chicago Style (17a ed.)

Feldt, Robert, Lyle Johnson, y Michael Neumann. Ruby Developer's Guide. Rockland, MA: Syngress Pub., 2002.

Cita MLA (8a ed.)

Feldt, Robert, et al. Ruby Developer's Guide. Syngress Pub., 2002.