APA

Ruiz M., Mills J. & Ruiz M. (1997). The Four agreements companion book. San Rafael, Calif: Amber-Allen Pub.

Chicago

Ruiz Miguel, Mills Janet and Ruiz Miguel. 1997. The Four agreements companion book. San Rafael, Calif: Amber-Allen Pub.

Harvard

Ruiz M., Mills J. and Ruiz M. (1997). The Four agreements companion book. San Rafael, Calif: Amber-Allen Pub.

MLA

Ruiz Miguel, Mills Janet and Ruiz Miguel. The Four agreements companion book. San Rafael, Calif: Amber-Allen Pub. 1997.