APA (7th ed.) Citation

Travers, P. L., & Shepard, M. (1944). Mary Poppins opens the door. P. Davies.

Chicago Style (17th ed.) Citation

Travers, P. L., and Mary Shepard. Mary Poppins Opens the Door. London: P. Davies, 1944.

MLA (9th ed.) Citation

Travers, P. L., and Mary Shepard. Mary Poppins Opens the Door. P. Davies, 1944.

Warning: These citations may not always be 100% accurate.