Intermediate Technology Development Group, Gater, A., Meller, T., & Warsany, J. (1968). Tools for progress: Guide to equipment and materials for small-scale development available in the United Kingdom. Intermediate Technology Development Group.

Intermediate Technology Development Group, Anthony Gater, Tim Meller, and John Warsany. Tools for Progress: Guide to Equipment and Materials for Small-scale Development Available in the United Kingdom. London: Intermediate Technology Development Group, 1968.

Intermediate Technology Development Group, et al. Tools for Progress: Guide to Equipment and Materials for Small-scale Development Available in the United Kingdom. Intermediate Technology Development Group, 1968.