Cita APA (7th ed.)

Kreeft, P. (1989). Three philosophies of life: Ecclesiastes--life as vanity, Job--life as suffering, Song of Songs--life as love. Ignatius Press.

Cita Chicago (17th ed.)

Kreeft, Peter. Three Philosophies of Life: Ecclesiastes--life as Vanity, Job--life as Suffering, Song of Songs--life as Love. San Francisco: Ignatius Press, 1989.

Cita MLA (9th ed.)

Kreeft, Peter. Three Philosophies of Life: Ecclesiastes--life as Vanity, Job--life as Suffering, Song of Songs--life as Love. Ignatius Press, 1989.