Jacobson, A. (1992). Think, think, think now!: Material and methods for problem solving. Phoenix Pub.
Dyfyniad Arddull ChicagoJacobson, Andrew. Think, Think, Think Now!: Material and Methods for Problem Solving. Quezon City: Phoenix Pub, 1992.
Dyfyniad MLAJacobson, Andrew. Think, Think, Think Now!: Material and Methods for Problem Solving. Phoenix Pub, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.