Cita APA (7th ed.)

Keen, S. (1983). The passionate life: Stages of loving. Harper & Row.

Cita Chicago (17th ed.)

Keen, Sam. The Passionate Life: Stages of Loving. San Francisco: Harper & Row, 1983.

Cita MLA (9th ed.)

Keen, Sam. The Passionate Life: Stages of Loving. Harper & Row, 1983.