Fuentes, C. Christopher Unborn. New York.
Chicago Style (17th ed.) ZitazioaFuentes, Carlos. Christopher Unborn. New York.
MLA (9th ed.) ZitazioaFuentes, Carlos. Christopher Unborn. New York.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
Fuentes, C. Christopher Unborn. New York.
Chicago Style (17th ed.) ZitazioaFuentes, Carlos. Christopher Unborn. New York.
MLA (9th ed.) ZitazioaFuentes, Carlos. Christopher Unborn. New York.