Crabtree, H. (1923). An elementary treatment of the theory of spinning tops and gyroscopic motion. Longmans, Green.
Lua i Stíl Chicago (17ú heag.)Crabtree, Harold. An Elementary Treatment of the Theory of Spinning Tops and Gyroscopic Motion. London: Longmans, Green, 1923.
Lua MLA (8ú heag.)Crabtree, Harold. An Elementary Treatment of the Theory of Spinning Tops and Gyroscopic Motion. Longmans, Green, 1923.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.