Petikan APA

Heng, R. W. K. (2009). Variation orders in design and build contracts.

Petikan Gaya Chicago

Heng, Robert Wei Kiong. Variation Orders in Design and Build Contracts. 2009.

Petikan MLA

Heng, Robert Wei Kiong. Variation Orders in Design and Build Contracts. 2009.

Amaran: Petikan-petikan ini tidak semestinya 100% tepat.