APA

Barnes M, Brigtwell R, . (1997). Secrets of lost empires. New York: Sterling Publishing Co.

Chicago

Barnes M, Brigtwell R, . 1997. Secrets of lost empires. New York: Sterling Publishing Co.

Harvard

Barnes M, Brigtwell R, . (1997). Secrets of lost empires. New York: Sterling Publishing Co.

MLA

Barnes M, Brigtwell R, . Secrets of lost empires. New York: Sterling Publishing Co. 1997.