APA

Gómez M. U., Duffy R., Trivelli V. & Stella F. (1979). At work in copper. New York: Inform.

Chicago

Gómez Manuel Ubaldo, Duffy Richard, Trivelli Vincent and Stella Frank. 1979. At work in copper. New York: Inform.

Harvard

Gómez M. U., Duffy R., Trivelli V. and Stella F. (1979). At work in copper. New York: Inform.

MLA

Gómez Manuel Ubaldo, Duffy Richard, Trivelli Vincent and Stella Frank. At work in copper. New York: Inform. 1979.