APA Style

Behrens, W., Hawranek, P, M. (1991). Manual for the Preparation of Industrial Feasibility Studies: Newly Revised dan Expanded Edition . Vienna: United Nations Industrial Development Organization.

MLA Style

Behrens, Werner., Hawranek, Peter, M.. "Manual for the Preparation of Industrial Feasibility Studies: Newly Revised dan Expanded Edition". Vienna: United Nations Industrial Development Organization, 1991. Books.