Bickel, C. L., Eigenfeld, N. D., & Hogg, J. C. (1973). Physical science investigations. Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Bickel, Charles Lester, Neal D. Eigenfeld, agus John Clarence Hogg. Physical Science Investigations. Boston: Houghton Mifflin, 1973.
Lua MLA (9ú heag.)Bickel, Charles Lester, et al. Physical Science Investigations. Houghton Mifflin, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.