International Economic Association, Lutz, F. A., & Hague, D. C. (1961). The theory of capital. Macmillan.

International Economic Association, Friedrich August Lutz, and Douglas Chalmers Hague. The Theory of Capital. Lond.: Macmillan, 1961.

International Economic Association, et al. The Theory of Capital. Macmillan, 1961.