APA (7th ed.) Citation

Jansson, T., & Hart, K. Moomipappa at Sea. Penguin Books.

Chicago Style (17th ed.) Citation

Jansson, Tove, and Kingsley Hart. Moomipappa at Sea. England: Penguin Books.

MLA (9th ed.) Citation

Jansson, Tove, and Kingsley Hart. Moomipappa at Sea. Penguin Books.

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