LUMSDEN, K. (1966). Microeconomics A Ppprogrammed Book Keith Lumsden, R. Attiyeh, George Leland Bach. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)LUMSDEN, Keith. Microeconomics A Ppprogrammed Book Keith Lumsden, R. Attiyeh, George Leland Bach. Prentice-Hall, 1966.
Lua MLA (8ú heag.)LUMSDEN, Keith. Microeconomics A Ppprogrammed Book Keith Lumsden, R. Attiyeh, George Leland Bach. Prentice-Hall, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.