Citazione Stile APA (7a Edizione)

Ballard, P. B. (1934). Group tests of intelligence (Primera edición.). University of London Press.

Citazione stile Chigago Style (17a edizione)

Ballard, Philip Boswood. Group Tests of Intelligence. Primera edición. London: University of London Press, 1934.

Citatione MLA (8a ed.)

Ballard, Philip Boswood. Group Tests of Intelligence. Primera edición. University of London Press, 1934.