Chaddock, R. E., & Croxton, F. E. (1928). Exercises in statistical methods. Houghton Mifflin company.
Lua i Stíl Chicago (17ú heag.)Chaddock, Robert Emmet, agus Frederick Emory Croxton. Exercises in Statistical Methods. Boston, New York [etc.]: Houghton Mifflin company, 1928.
Lua MLA (8ú heag.)Chaddock, Robert Emmet, agus Frederick Emory Croxton. Exercises in Statistical Methods. Houghton Mifflin company, 1928.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.