Platt, N., & Drummond, M. J. (1967). Our world through the ages (3rd ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Platt, Nathaniel, agus Muriel Jean Drummond. Our World Through the Ages. 3rd ed. Englewood Cliffs, N.J.: Prentice-Hall, 1967.
Lua MLA (8ú heag.)Platt, Nathaniel, agus Muriel Jean Drummond. Our World Through the Ages. 3rd ed. Prentice-Hall, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.