Jacobson, A. (1992). Think, think, think now!: Material and methods for problem solving. Phoenix Pub.
Chicago-Zitierstil (17. Ausg.)Jacobson, Andrew. Think, Think, Think Now!: Material and Methods for Problem Solving. Quezon City: Phoenix Pub, 1992.
MLA-Zitierstil (9. Ausg.)Jacobson, Andrew. Think, Think, Think Now!: Material and Methods for Problem Solving. Phoenix Pub, 1992.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.