Cita APA (7a ed.)

Vanek, J. (1968). The factor proportions theory: The N-factor case. [s.n.].

Cita Chicago Style (17a ed.)

Vanek, Jaroslav. The Factor Proportions Theory: The N-factor Case. [S.l.]: [s.n.], 1968.

Cita MLA (9a ed.)

Vanek, Jaroslav. The Factor Proportions Theory: The N-factor Case. [s.n.], 1968.