APA (7th ed.) Citation

Macdonald, M. (1990). Sam's Worries. All Books for Children.

Chicago Style (17th ed.) Citation

Macdonald, Maryann. Sam's Worries. London: All Books for Children, 1990.

MLA (9th ed.) Citation

Macdonald, Maryann. Sam's Worries. All Books for Children, 1990.