Cita APA (7a ed.)

Carlson, L., & Richardson, L. (2012). Ruby: Receptury. Helion.

Cita Chicago Style (17a ed.)

Carlson, Lucas, y Leonard Richardson. Ruby: Receptury. [Gliwice, Poland?]: Helion, 2012.

Cita MLA (8a ed.)

Carlson, Lucas, y Leonard Richardson. Ruby: Receptury. Helion, 2012.