APA

Gifford R., . (2002). Environmental psychology. [s.l.]: Optimal books.

Chicago

Gifford Robert, . 2002. Environmental psychology. [s.l.]: Optimal books.

Harvard

Gifford R., . (2002). Environmental psychology. [s.l.]: Optimal books.

MLA

Gifford Robert, . Environmental psychology. [s.l.]: Optimal books. 2002.