APA (7th ed.) Citation

Oppenheim, A. L. (1944). Notes to the Harper-Letters.

Chicago Style (17th ed.) Citation

Oppenheim, A. L. Notes to the Harper-Letters. 1944.

MLA (8th ed.) Citation

Oppenheim, A. L. Notes to the Harper-Letters. 1944.

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