Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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