The technique of water-colour painting.

MLA

Richmond, Leonard, and John Littlejohns. The Technique of Water-colour Painting. London: Isaac Pitman & Sons, 1930.

APA

Richmond, L., & Littlejohns, J. (1930). The technique of water-colour painting. London: Isaac Pitman & Sons.

Chicago

Richmond, Leonard, and John Littlejohns. The Technique of Water-Colour Painting. London: Isaac Pitman & Sons, 1930.