Gaya APA

KATZENSTEIN, Herbert, SACHS, William S.. (1992). Direct Marketing (2nd.ed). Singapore: Macmillan Publishing Co..,INC.

Gaya Chicago

KATZENSTEIN, Herbert, SACHS, William S.. Direct Marketing. 2nd.ed Singapore: Macmillan Publishing Co..,INC, 1992. .

Gaya MLA

KATZENSTEIN, Herbert, SACHS, William S.. Direct Marketing. 2nd.ed Singapore: Macmillan Publishing Co..,INC, 1992. .

Gaya Turabian

KATZENSTEIN, Herbert, SACHS, William S.. Direct Marketing. 2nd.ed Singapore: Macmillan Publishing Co..,INC, 1992. .