Perry, S., & Dawson, J. (1988). The secrets our body clocks reveal. Rawson Associates.
Lua i Stíl Chicago (17ú heag.)Perry, Susan, agus Jim Dawson. The Secrets Our Body Clocks Reveal. New York: Rawson Associates, 1988.
Lua MLA (9ú heag.)Perry, Susan, agus Jim Dawson. The Secrets Our Body Clocks Reveal. Rawson Associates, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.