APA (7th ed.) Citation

Brown, R. J., & Brown, E. J. (1969). Economics, workbook. Brooks.

Chicago Style (17th ed.) Citation

Brown, R. J., and E. J. Brown. Economics, Workbook. Syd.: Brooks, 1969.

MLA (8th ed.) Citation

Brown, R. J., and E. J. Brown. Economics, Workbook. Brooks, 1969.