APA (7th ed.) Citation

Castle, A., & Castle, E. IF youth but knew! Thomas Nelson and Sons, eds.

Chicago Style (17th ed.) Citation

Castle, Agnes, and Egerton Castle. IF Youth but Knew! London: Thomas Nelson and Sons, eds.

MLA (9th ed.) Citation

Castle, Agnes, and Egerton Castle. IF Youth but Knew! Thomas Nelson and Sons, eds.

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