APA (7th ed.) Citation

Koos, E. L. (1950). Families in trouble (2. print.). King's Crown Press.

Chicago Style (17th ed.) Citation

Koos, Earl Lomon. Families in Trouble. 2. print. New York: King's Crown Press, 1950.

MLA (9th ed.) Citation

Koos, Earl Lomon. Families in Trouble. 2. print. King's Crown Press, 1950.