APA
Yuan L. L., Ofori G. & National University of Singapore School of Building and Estate Management. (1991). Maintenance management in Singapore. Singapore: National University of Singapore.
Chicago
Yuan Lim Lan, Ofori George and National University of Singapore School of Building and Estate Management. 1991. Maintenance management in Singapore. Singapore: National University of Singapore.
Harvard
Yuan L. L., Ofori G. and National University of Singapore School of Building and Estate Management. (1991). Maintenance management in Singapore. Singapore: National University of Singapore.
MLA
Yuan Lim Lan, Ofori George and National University of Singapore School of Building and Estate Management. Maintenance management in Singapore. Singapore: National University of Singapore. 1991.
