Cite Them Right 11th edition - Harvard

Guttag, J. and Guttag, J. (2014) Introduction to Computation and Programming Using Python.

Chicago Manual of Style 17th edition (full note)

Guttag, John, and John Guttag. Introduction to Computation and Programming Using Python.

American Psychological Association 7th edition

Guttag, J., & Guttag, J. (2014). Introduction to Computation and Programming Using Python.

Modern Language Association 9th edition

Guttag, J., and J. Guttag. Introduction to Computation and Programming Using Python. 2014.

ISO-690 (author-date, Deutsch)

GUTTAG, John and John GUTTAG, 2014. Introduction to Computation and Programming Using Python

Warning: These citations may not always be 100% accurate.