APA استشهاد

Willsmore, A. (1950). Product development and design. Sir Isaac pitman.

استشهاد بنمط شيكاغو

Willsmore, A.W. Product Development and Design. London: Sir Isaac pitman, 1950.

MLA استشهاد

Willsmore, A.W. Product Development and Design. Sir Isaac pitman, 1950.