APA

Northcott, PSI team, . (1991). Britain in 2010. London: PSI Publishing.

Chicago

Northcott, PSI team, . 1991. Britain in 2010. London: PSI Publishing.

Harvard

Northcott, PSI team, . (1991). Britain in 2010. London: PSI Publishing.

MLA

Northcott, PSI team, . Britain in 2010. London: PSI Publishing. 1991.