APA

(1996). Vision - Vol.87 No.9 (1996). México: Vision Incorporated.

Chicago

1996. Vision - Vol.87 No.9 (1996). México: Vision Incorporated.

Harvard

(1996). Vision - Vol.87 No.9 (1996). México: Vision Incorporated.

MLA

Vision - Vol.87 No.9 (1996). México: Vision Incorporated. 1996.