APA (7th ed.) Citation

Hughes, J., & Thomas, M. J. (1990). Naturetrek environment puzzle book: (key stages 2 and 3). Naturetrek Educational.

Chicago Style (17th ed.) Citation

Hughes, Julian, and M. J. Thomas. Naturetrek Environment Puzzle Book: (key Stages 2 and 3). Clwyd, Wales: Naturetrek Educational, 1990.

MLA (9th ed.) Citation

Hughes, Julian, and M. J. Thomas. Naturetrek Environment Puzzle Book: (key Stages 2 and 3). Naturetrek Educational, 1990.