Cita APA (7a ed.)

Grabowski, H. G., & Mueller, D. C. (1978). Industrial research and development, intangible capital stocks and firm profit rates. [s.n.].

Cita Chicago Style (17a ed.)

Grabowski, Henry G., y Dennis C. Mueller. Industrial Research and Development, Intangible Capital Stocks and Firm Profit Rates. [S.l.]: [s.n.], 1978.

Cita MLA (9a ed.)

Grabowski, Henry G., y Dennis C. Mueller. Industrial Research and Development, Intangible Capital Stocks and Firm Profit Rates. [s.n.], 1978.