APA (7e ed.) Bronvermelding

WESTING J H. (1969). PURCHASING MANAGEMENT MATERIALS IN MOTION. JOHN WILEY AND SONS.

Chicago (17e ed.) Bronvermelding

WESTING J H. PURCHASING MANAGEMENT MATERIALS IN MOTION. NEW YORK: JOHN WILEY AND SONS, 1969.

MLA (9e ed.) Bronvermelding

WESTING J H. PURCHASING MANAGEMENT MATERIALS IN MOTION. JOHN WILEY AND SONS, 1969.