Clerk, D., & Burls, G. A. (1909). The gas, petrol, and oil engine (New and rev. ed.). Longmans, Green.

Clerk, Dugald, and G. A. Burls. The Gas, Petrol, and Oil Engine. New and rev. ed. London: Longmans, Green, 1909.

Clerk, Dugald, and G. A. Burls. The Gas, Petrol, and Oil Engine. New and rev. ed. Longmans, Green, 1909.