MLA

Rolt, L. T. C, and John S Allen. The Steam Engine of Thomas Newcomen. Hartington: Moorland, 1977.

APA

Rolt, L. T. C, & Allen, J. S. (1977). The Steam engine of Thomas Newcomen. Hartington: Moorland.

Chicago

Rolt, L. T. C., and John S Allen. The Steam Engine of Thomas Newcomen. Hartington: Moorland, 1977.