Cita APA (7a ed.)

Hertog, R. G. J. d., & Thurik, A. R. (1993). Determinants of internal and external R&D: Some Dutch evidence. [s.n.].

Cita Chicago Style (17a ed.)

Hertog, René G. J. den, y A. Roy Thurik. Determinants of Internal and External R&D: Some Dutch Evidence. [S.l.]: [s.n.], 1993.

Cita MLA (9a ed.)

Hertog, René G. J. den, y A. Roy Thurik. Determinants of Internal and External R&D: Some Dutch Evidence. [s.n.], 1993.