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MILLER, CHARLES D., VERN E. HEEREN, and JOHN HORNSBY. Consumer mathematics. In Mathematical Ideas, 11th ed., Pearson Education/Addison Wesley, Reading, MA, 2008.

YAREMA, CONNIE H., and JOHN H. SAMPSON. Just say “Charge it!” Mathematics Teacher 94 (7) (October 2001), 558–564. Shows how to apply the savings formula and the amortization formula and graph the results on the TI-83 calculator. Notes that the 78% of undergraduates in the United States who have credit cards carry an average debt of more than $2700, with 10% owing more than $7000.