APA (7th ed.) Citation

Howard, A. E., Farmer, W., & Blackman, R. A. (1968). Teaching mathematics. Longmans.

Chicago Style (17th ed.) Citation

Howard, Alexander Edward, Wilfred Farmer, and Ronald Albert Blackman. Teaching Mathematics. [London]: Longmans, 1968.

MLA (8th ed.) Citation

Howard, Alexander Edward, et al. Teaching Mathematics. Longmans, 1968.