APA (7th ed.) Citation

Travers, P. L., & Shepard, M. (1948). Mary Poppins opens the door. The Albatross.

Chicago Style (17th ed.) Citation

Travers, P. L., and Mary Shepard. Mary Poppins Opens the Door. London: The Albatross, 1948.

MLA (9th ed.) Citation

Travers, P. L., and Mary Shepard. Mary Poppins Opens the Door. The Albatross, 1948.

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