APA (7th ed.) Citation

Travers, P. L., & Shepard, M. (1947). Mary Poppins comes back (9th printing.). P. Davies.

Chicago Style (17th ed.) Citation

Travers, P. L., and Mary Shepard. Mary Poppins Comes Back. 9th printing. London: P. Davies, 1947.

MLA (9th ed.) Citation

Travers, P. L., and Mary Shepard. Mary Poppins Comes Back. 9th printing. P. Davies, 1947.