APA
(1986). Colombia Exporta - Vol.5 No.24,23,22,21,20,19. : .
Chicago
1986. Colombia Exporta - Vol.5 No.24,23,22,21,20,19. : .
Harvard
(1986). Colombia Exporta - Vol.5 No.24,23,22,21,20,19. : .
MLA
Colombia Exporta - Vol.5 No.24,23,22,21,20,19. : . 1986.