Schwetje Gerald. (2010). Business Plan. Springer.
Lua i Stíl Chicago (17ú heag.)Schwetje Gerald. Business Plan. New York: Springer, 2010.
Lua MLA (9ú heag.)Schwetje Gerald. Business Plan. Springer, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.