APA (7th ed.) Citation

Pyefinch, H. (1790). The pentagraph; improved by Henry Pyefinch, optician, Cornhill, London. [publisher not identified].

Chicago Style (17th ed.) Citation

Pyefinch, Henry. The Pentagraph; Improved by Henry Pyefinch, Optician, Cornhill, London. [London]: [publisher not identified], 1790.

MLA (9th ed.) Citation

Pyefinch, Henry. The Pentagraph; Improved by Henry Pyefinch, Optician, Cornhill, London. [publisher not identified], 1790.