Gaya APA

Keat, P, G., Young, P, K, Y. (2005). Managerial Economics : Econimic Tools for Today's Decision Makers (4). Singapore: Pearson Education.

Gaya MLA

Keat, Paul, G.., Young, Philip, K., Y.. "Managerial Economics : Econimic Tools for Today's Decision Makers". 4 Singapore: Pearson Education, 2005. Text.