Cita APA (7a ed.)

Keesing, D. B. (1965). Labor skills and international trade: Evaluating many trade flows with a single measuring device. [s.n.].

Cita Chicago Style (17a ed.)

Keesing, Donald B. Labor Skills and International Trade: Evaluating Many Trade Flows with a Single Measuring Device. [S.l.]: [s.n.], 1965.

Cita MLA (9a ed.)

Keesing, Donald B. Labor Skills and International Trade: Evaluating Many Trade Flows with a Single Measuring Device. [s.n.], 1965.