APA

(1989). Tribuna Alemana - No.981-982,983-989,991,992,994,996,998. Alemania: Niemeyer Druck Hameln.

Chicago

1989. Tribuna Alemana - No.981-982,983-989,991,992,994,996,998. Alemania: Niemeyer Druck Hameln.

Harvard

(1989). Tribuna Alemana - No.981-982,983-989,991,992,994,996,998. Alemania: Niemeyer Druck Hameln.

MLA

Tribuna Alemana - No.981-982,983-989,991,992,994,996,998. Alemania: Niemeyer Druck Hameln. 1989.