APA (7th ed.) Citation

Caldwell, A., & Wood, J. N. (1969). Caldwell's screw tug design (2nd ed.). Hutchinson.

Chicago Style (17th ed.) Citation

Caldwell, A., and Jeffrey N. Wood. Caldwell's Screw Tug Design. 2nd ed. London: Hutchinson, 1969.

MLA (8th ed.) Citation

Caldwell, A., and Jeffrey N. Wood. Caldwell's Screw Tug Design. 2nd ed. Hutchinson, 1969.