Παραπομπή σε μορφή APA (7η εκδ.)

Koch Richard. (1998). The 80/20 principle: The secret of achieving more with less. Currency/Doubleday.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Koch Richard. The 80/20 Principle: The Secret of Achieving More with Less. Currency/Doubleday, 1998.

Παραπομπή σε μορφή MLA (8th εκδ.)

Koch Richard. The 80/20 Principle: The Secret of Achieving More with Less. Currency/Doubleday, 1998.