APA (7th ed.) Citation

Ison, G. (2021). Hardcastle's secret agent (First world edition.). Severn House.

Chicago Style (17th ed.) Citation

Ison, Graham. Hardcastle's Secret Agent. First world edition. Edinburgh: Severn House, 2021.

MLA (8th ed.) Citation

Ison, Graham. Hardcastle's Secret Agent. First world edition. Severn House, 2021.

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