Παραπομπή σε μορφή APA (7η εκδ.)

Herr, T., & Johnson, K. (1994). Problem solving strategies: Teacher's resource book and answer key. Key Curriculum Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Herr, Ted, και Ken Johnson. Problem Solving Strategies: Teacher's Resource Book and Answer Key. Berkeley, Calif: Key Curriculum Press, 1994.

Παραπομπή σε μορφή MLA (9th εκδ.)

Herr, Ted, και Ken Johnson. Problem Solving Strategies: Teacher's Resource Book and Answer Key. Key Curriculum Press, 1994.