MLA

Nielson, Seth James, and Christopher K Monson. Practical Cryptography In Python. Apress, 2019.

APA

Nielson, S. James, & Monson, C. K. (2019). Practical Cryptography in Python. Apress.

Chicago

Nielson, Seth James, and Christopher K Monson. Practical Cryptography In Python. : Apress, 2019.