Cita APA (7a ed.)

Elson, H. W., & MacMullan, C. E. (1915). The story of the Old world. World Book Co..

Cita Chicago Style (17a ed.)

Elson, Henry W., y Cornelia E. MacMullan. The Story of the Old World. Yonkers-on-Hudson: World Book Co., 1915.

Cita MLA (8a ed.)

Elson, Henry W., y Cornelia E. MacMullan. The Story of the Old World. World Book Co., 1915.