APA (7e ed.) Bronvermelding

RIES AL. (1990). BOTTOM-UP MARKETING. PLUME BOOK.

Chicago (17e ed.) Bronvermelding

RIES AL. BOTTOM-UP MARKETING. NEW YORK: PLUME BOOK, 1990.

MLA (9e ed.) Bronvermelding

RIES AL. BOTTOM-UP MARKETING. PLUME BOOK, 1990.