APA (7th ed.) Citation

Enid Blyton. (1954). The Secret Seven, Good Work, Secret Seven (2015.). Hodder Children's book.

Chicago Style (17th ed.) Citation

Enid Blyton. The Secret Seven, Good Work, Secret Seven. 2015. Hodder Children's book, 1954.

MLA (9th ed.) Citation

Enid Blyton. The Secret Seven, Good Work, Secret Seven. 2015. Hodder Children's book, 1954.

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