APA (7th ed.) Citation

Penn, W., & Murray, R. H. 1. L. Some unpublished letters of William Penn.

Chicago Style (17th ed.) Citation

Penn, William, and Robert H. 1874- Litt.D Murray. Some Unpublished Letters of William Penn.

MLA (9th ed.) Citation

Penn, William, and Robert H. 1874- Litt.D Murray. Some Unpublished Letters of William Penn.

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