Harper, H. A. (1978). Dr. Erhardt's letter was referred to Harold A. Harper, Phd, who replies as follows.
Citação norma ChicagoHarper, Harold A. Dr. Erhardt's Letter Was Referred to Harold A. Harper, Phd, Who Replies As Follows. 1978.
Citação norma MLAHarper, Harold A. Dr. Erhardt's Letter Was Referred to Harold A. Harper, Phd, Who Replies As Follows. 1978.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.