Παραπομπή σε μορφή APA (7η εκδ.)

Research and Education Association & Direct, F. M. (1980). Problem solver in strength of materials and mechanics of solids. Research and Education Association.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Research and Education Association και Fogiel M. Direct. Problem Solver in Strength of Materials and Mechanics of Solids. New Jersey: Research and Education Association, 1980.

Παραπομπή σε μορφή MLA (8th εκδ.)

Research and Education Association και Fogiel M. Direct. Problem Solver in Strength of Materials and Mechanics of Solids. Research and Education Association, 1980.