JOHNSON KERRY L. (1994). SALES MAGIC. REVOLUTIONARY NEW TECHNIQUES THAT WILL DOUBLE YOUR SALES VOLUMES IN 21 DAYS. WILLIAM MORROW.
Lua i Stíl Chicago (17ú heag.)JOHNSON KERRY L. SALES MAGIC. REVOLUTIONARY NEW TECHNIQUES THAT WILL DOUBLE YOUR SALES VOLUMES IN 21 DAYS. NEW YORK: WILLIAM MORROW, 1994.
Lua MLA (9ú heag.)JOHNSON KERRY L. SALES MAGIC. REVOLUTIONARY NEW TECHNIQUES THAT WILL DOUBLE YOUR SALES VOLUMES IN 21 DAYS. WILLIAM MORROW, 1994.
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