APA (7th ed.) Citation

Richardson, H. H., Robertson, J. G., & Roncoroni, O. M. (1948). Myself when young. Heinemann.

Chicago Style (17th ed.) Citation

Richardson, Henry Handel, J. G. Robertson, and Olga M. Roncoroni. Myself When Young. Melbourne: Heinemann, 1948.

MLA (8th ed.) Citation

Richardson, Henry Handel, et al. Myself When Young. Heinemann, 1948.