Powis, R. (1985). The human body and why it works. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Powis, Raymond. The Human Body and Why It Works. Englewood Cliffs, New Jersey: Prentice-Hall, 1985.
Lua MLA (9ú heag.)Powis, Raymond. The Human Body and Why It Works. Prentice-Hall, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.