Butts, D. P. (1974). The teaching of science: A self-directed planning guide. Harper & Row.
Chicago-Zitierstil (17. Ausg.)Butts, David P. The Teaching of Science: A Self-directed Planning Guide. New York: Harper & Row, 1974.
MLA-Zitierstil (9. Ausg.)Butts, David P. The Teaching of Science: A Self-directed Planning Guide. Harper & Row, 1974.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.