APA (7th ed.) Citation

Penny, S. (1780). Stephen Penny's Letter, to his sister Martha Penny.

Chicago Style (17th ed.) Citation

Penny, Stephen. Stephen Penny's Letter, to His Sister Martha Penny. [Bristol?], 1780.

MLA (9th ed.) Citation

Penny, Stephen. Stephen Penny's Letter, to His Sister Martha Penny. 1780.

Warning: These citations may not always be 100% accurate.