Cohen, David
Precalculus: a problem-oriented approach
Thomson Brooks/Cole, 2005
 Buku Teks SO
Problem-oriented systems of patient care
National League for Nursing , 1974
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Yao and Artusio's anesthesiology: problem-oriented patient management
Fun-Sun F. Yao, editor
Lippincott Williams & Wilkins, 2008
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Spanogle, John A.
International sales law a problem oriented coursebook
St. Paul Minn, 2000
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Folsom, Ralph Haughwout
International business transactions a problem oriented coursebook
West Group, 1999
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