Kirkaldy, A. W., & Evans, A. D. (1920). The history and economics of transport (2nd ed.). Sir I. Pitman & Sons.
Lua i Stíl Chicago (17ú heag.)Kirkaldy, Adam Willis, agus Alfred Dudley Evans. The History and Economics of Transport. 2nd ed. London ; New York: Sir I. Pitman & Sons, 1920.
Lua MLA (8ú heag.)Kirkaldy, Adam Willis, agus Alfred Dudley Evans. The History and Economics of Transport. 2nd ed. Sir I. Pitman & Sons, 1920.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.