Gaya APA

Wallace, W, L., Xia, Y. (2015). Delivering customer value through procurement and strategic sourcing : a professional guide to creating a sustainable supply network . New Jersey: Pearson Education.

Gaya MLA

Wallace, Walter, L.., Xia, Yusen. "Delivering customer value through procurement and strategic sourcing : a professional guide to creating a sustainable supply network". New Jersey: Pearson Education, 2015. Buku/Printed Material.