Cita APA (7a ed.)

Smith, V. L. (1968). Economics of production fron natural resources. [s.n.].

Cita Chicago Style (17a ed.)

Smith, Vernon L. Economics of Production Fron Natural Resources. [S.l.]: [s.n.], 1968.

Cita MLA (9a ed.)

Smith, Vernon L. Economics of Production Fron Natural Resources. [s.n.], 1968.