APA (7th ed.) Citation

Unwin, D. (1992). A key to the families of British Diptera ([3rd reprint].). FSC Publications.

Chicago Style (17th ed.) Citation

Unwin, D.M. A Key to the Families of British Diptera. [3rd reprint]. Preston Montford: FSC Publications, 1992.

MLA (9th ed.) Citation

Unwin, D.M. A Key to the Families of British Diptera. [3rd reprint]. FSC Publications, 1992.