APA (7th ed.) Citation

Forester, C. S., John, R., & Humphries, G. (1969). Flying colours. Longmans.

Chicago Style (17th ed.) Citation

Forester, C. S., Roland John, and Graham Humphries. Flying Colours. London: Longmans, 1969.

MLA (9th ed.) Citation

Forester, C. S., et al. Flying Colours. Longmans, 1969.