Humphries, J. (1993). How to manage a sales team: A practical guide to sales leadership. Grolier International.
Lua i Stíl Chicago (17ú heag.)Humphries, John. How to Manage a Sales Team: A Practical Guide to Sales Leadership. Hong Kong: Grolier International, 1993.
Lua MLA (9ú heag.)Humphries, John. How to Manage a Sales Team: A Practical Guide to Sales Leadership. Grolier International, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.