APA (7th ed.) Citation

Lynne Reid Banks. (1975). Two is Lonely. Companion Book Club.

Chicago Style (17th ed.) Citation

Lynne Reid Banks. Two Is Lonely. London: Companion Book Club, 1975.

MLA (9th ed.) Citation

Lynne Reid Banks. Two Is Lonely. Companion Book Club, 1975.

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