Παραπομπή σε μορφή APA (7η εκδ.)

Gonda,Cyrus M. Where is my ketchup: How to give & receive exceotional customer service. Embassy Book.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Gonda,Cyrus M. Where Is My Ketchup: How to Give & Receive Exceotional Customer Service. Mumbai: Embassy Book.

Παραπομπή σε μορφή MLA (9th εκδ.)

Gonda,Cyrus M. Where Is My Ketchup: How to Give & Receive Exceotional Customer Service. Embassy Book.