APA Citation

Wagner, O., & Bernabei, G. (1984). Otto Wagner. Barcelona: GG.

Chicago style citation

Wagner, Otto, and Giancarlo Bernabei. Otto Wagner. Barcelona: GG, 1984.

MLA citation

Wagner, Otto, and Giancarlo Bernabei. Otto Wagner. Barcelona: GG, 1984.

Warning: these citations may not always be totally accurate