APA (7th ed.) Citation

Locke, J. (1764). A letter concerning toleration (The fourth edition.).

Chicago Style (17th ed.) Citation

Locke, John. A Letter Concerning Toleration. The fourth edition. 1764.

MLA (9th ed.) Citation

Locke, John. A Letter Concerning Toleration. The fourth edition. 1764.

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