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

MLA

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

APA

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

Chicago

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