BETTGER FRANK. (1982). HOW I RAISED MYSELF FROM FAILURE TO SUCCESS IN SELLING. SIMON & SCHUSTER INC.
Citazione stile Chigago Style (17a edizione)BETTGER FRANK. HOW I RAISED MYSELF FROM FAILURE TO SUCCESS IN SELLING. NEW YORK: SIMON & SCHUSTER INC, 1982.
Citatione MLA (9a ed.)BETTGER FRANK. HOW I RAISED MYSELF FROM FAILURE TO SUCCESS IN SELLING. SIMON & SCHUSTER INC, 1982.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.