H.W. · P. H. · P.H. Whiting · P W.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| LAS CINCO GRANDES REGLAS DE LA VENTA | 978-84-282-0414-9 (84-282-0414-4) | 1992 |
| LOS CINCO GRANDES PROBLEMAS DEL VENDEDOR: FIVE GREAT PROBLEMS. | 978-84-282-0265-7 (84-282-0265-6) | 1996 |
| The Five Great Problems of Salesmen and How to Solve Them | 978-0-07-069960-1 (0-07-069960-7) | 1964 |