Gaya APA

Leong, J, D, W, K, T, G, K. (2012). Principles of supply chain management a balanced approach (Third edition). Australia: South-Western Cengage Learning.

Gaya MLA

Leong, Joel, D., Wisner,, Keah-Choon, Tan,, G., Keong. "Principles of supply chain management a balanced approach". Third edition Australia: South-Western Cengage Learning, 2012. Electronic Resource.