APA استشهاد

Willis, A. (1980). Practice and procedure for the quantity surveyor (8th Ed.). Granada.

استشهاد بنمط شيكاغو

Willis, Arthur.J. Practice and Procedure for the Quantity Surveyor. 8th Ed. London: Granada, 1980.

MLA استشهاد

Willis, Arthur.J. Practice and Procedure for the Quantity Surveyor. 8th Ed. Granada, 1980.