Polentz, L. M. Engineering fundamentals for professional engineers examinations (3a ed.).
Chicago-viite (17. p.)Polentz, Lloyd M. Engineering Fundamentals for Professional Engineers Examinations. 3a ed.
MLA-viite (8. p.)Polentz, Lloyd M. Engineering Fundamentals for Professional Engineers Examinations. 3a ed.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.