Gaya APA

Encyclopedia Britannica, Inc.. (1970). Encyclopedia Britannica - Volume 21 : Spelman to Timmins . USA: William Benton, Publisher.

Gaya Chicago

Encyclopedia Britannica, Inc.. Encyclopedia Britannica - Volume 21 : Spelman to Timmins. USA: William Benton, Publisher, 1970. Text.

Gaya MLA

Encyclopedia Britannica, Inc.. Encyclopedia Britannica - Volume 21 : Spelman to Timmins. USA: William Benton, Publisher, 1970. Text.

Gaya Turabian

Encyclopedia Britannica, Inc.. Encyclopedia Britannica - Volume 21 : Spelman to Timmins. USA: William Benton, Publisher, 1970. Print.