APA (7th ed.) Citation

Jill Murphy. (1998). The Worst Witch. Penquin Group.

Chicago Style (17th ed.) Citation

Jill Murphy. The Worst Witch. Penquin Group, 1998.

MLA (9th ed.) Citation

Jill Murphy. The Worst Witch. Penquin Group, 1998.

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