Greenaway, D., & Lee, M. W. (1948). Tourist expenditures, State of Washington, 1947: A pilot study.
Lua i Stíl Chicago (17ú heag.)Greenaway, Donald, agus Maurice Winthrop Lee. Tourist Expenditures, State of Washington, 1947: A Pilot Study. Pullman, 1948.
Lua MLA (8ú heag.)Greenaway, Donald, agus Maurice Winthrop Lee. Tourist Expenditures, State of Washington, 1947: A Pilot Study. 1948.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.