THEIL, H., BOOT, J. C., & KLOEK, T. (1965). Operations research and quantitative economics: An elementary introduction. McGraw-Hill Bo. Co.

THEIL, Henri, John C.G BOOT, and Teun KLOEK. Operations Research and Quantitative Economics: An Elementary Introduction. San Francisco: McGraw-Hill Bo. Co, 1965.

THEIL, Henri, et al. Operations Research and Quantitative Economics: An Elementary Introduction. McGraw-Hill Bo. Co, 1965.