S.E. Jorgensen and R.A. Vollenweider, Guidelines of Lake Management, Volume 1 - Principles of Lake Management, International Lake Environment Committee (Online versionArchived 2011-05-23 at the Wayback Machine)
S.E. Jorgensen and R.A. Vollenweider, Guidelines of Lake Management, Volume 1 - Principles of Lake Management, International Lake Environment Committee (Online versionArchived 2011-05-23 at the Wayback Machine)