APA

(1991). Consigna - No.420-421,418-419,414-415,412-413,410-411,406-407,404-405,400,390. Bogotá: Universidad de Boyacá.

Chicago

1991. Consigna - No.420-421,418-419,414-415,412-413,410-411,406-407,404-405,400,390. Bogotá: Universidad de Boyacá.

Harvard

(1991). Consigna - No.420-421,418-419,414-415,412-413,410-411,406-407,404-405,400,390. Bogotá: Universidad de Boyacá.

MLA

Consigna - No.420-421,418-419,414-415,412-413,410-411,406-407,404-405,400,390. Bogotá: Universidad de Boyacá. 1991.