APA

(1998). Vision - Vol.91 No.12 (1998). México: Vision Incorporated.

Chicago

1998. Vision - Vol.91 No.12 (1998). México: Vision Incorporated.

Harvard

(1998). Vision - Vol.91 No.12 (1998). México: Vision Incorporated.

MLA

Vision - Vol.91 No.12 (1998). México: Vision Incorporated. 1998.