APA

Barrett J., . (2004). The aptitude test workbook. London: Kogan Page.

Chicago

Barrett Jim, . 2004. The aptitude test workbook. London: Kogan Page.

Harvard

Barrett J., . (2004). The aptitude test workbook. London: Kogan Page.

MLA

Barrett Jim, . The aptitude test workbook. London: Kogan Page. 2004.