Keehn, T. B. (1971). Functional education for family life planning: A program plan. World Education.
Chicago-viite (17. p.)Keehn, Thomas B. Functional Education for Family Life Planning: A Program Plan. New York: World Education, 1971.
MLA-viite (8. p.)Keehn, Thomas B. Functional Education for Family Life Planning: A Program Plan. World Education, 1971.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.