Rennert, M. (1974). Circle of death. Prentice-Hall.
Cita Chicago (17th ed.)Rennert, Maggie. Circle of Death. Englewood Cliffs., N.J.: Prentice-Hall, 1974.
Cita MLA (8th ed.)Rennert, Maggie. Circle of Death. Prentice-Hall, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.