Cita APA

Friend, F. J. (2004). Looking from the Past to the Future. Public Library of Science.

Chicago Style Citation

Friend, Frederick J. Looking From the Past to the Future. Public Library of Science, 2004.

Cita MLA

Friend, Frederick J. Looking From the Past to the Future. Public Library of Science, 2004.

Atenció: Aquestes cites poden no estar 100% correctes.