Παραπομπή σε μορφή APA (7η εκδ.)

Engstrom, T. W. (1985). The fine art of friendship: Building and maintaining quality relationships. Thomas Nelson.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Engstrom, Ted W. The Fine Art of Friendship: Building and Maintaining Quality Relationships. Nashville: Thomas Nelson, 1985.

Παραπομπή σε μορφή MLA (9th εκδ.)

Engstrom, Ted W. The Fine Art of Friendship: Building and Maintaining Quality Relationships. Thomas Nelson, 1985.