Sam, P. A. (1999). International environmental consulting practice: How and where to take advantage of global opportunities. John Wiley.
Lua i Stíl Chicago (17ú heag.)Sam, Peter A. International Environmental Consulting Practice: How and Where to Take Advantage of Global Opportunities. New York: John Wiley, 1999.
Lua MLA (8ú heag.)Sam, Peter A. International Environmental Consulting Practice: How and Where to Take Advantage of Global Opportunities. John Wiley, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.