APA (7th ed.) Citation

(1831). Six letters on subjects very important to England. Blackwood etc..

Chicago Style (17th ed.) Citation

Six Letters on Subjects Very Important to England. Blackwood etc., 1831.

MLA (8th ed.) Citation

Six Letters on Subjects Very Important to England. Blackwood etc., 1831.

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