APA (7th ed.) Citation

Stevenson, R. L., Beauvais, A., & Munro, N. (1965). Treasure island. Collins.

Chicago Style (17th ed.) Citation

Stevenson, Robert Louis, Arnold Beauvais, and Neil Munro. Treasure Island. London [etc.]: Collins, 1965.

MLA (9th ed.) Citation

Stevenson, Robert Louis, et al. Treasure Island. Collins, 1965.