Cita APA (7a ed.)

Shaw, Z. A. (2014). Learn Ruby the Hard Way: A Simple and Idiomatic Introduction to the Imaginative World of Computational Thinking with Code, Third Edition. Addison-Wesley Professional.

Cita Chicago Style (17a ed.)

Shaw, Zed A. Learn Ruby the Hard Way: A Simple and Idiomatic Introduction to the Imaginative World of Computational Thinking with Code, Third Edition. [Place of publication not identified]: Addison-Wesley Professional, 2014.

Cita MLA (8a ed.)

Shaw, Zed A. Learn Ruby the Hard Way: A Simple and Idiomatic Introduction to the Imaginative World of Computational Thinking with Code, Third Edition. Addison-Wesley Professional, 2014.