Encyclopedia Britannica; first published in 1768 by a society of gentlemen in Scotland

MLA

Encyclopedia Britannica; First Published In 1768 by a Society of Gentlemen In Scotland. London: Encyclopedia Britannica inc., 1971.

APA

(1971). Encyclopedia Britannica; first published in 1768 by a society of gentlemen in Scotland. London: Encyclopedia Britannica inc.

Chicago

Encyclopedia Britannica; First Published In 1768 by a Society of Gentlemen In Scotland. London: Encyclopedia Britannica inc., 1971.