Jacques Boisvert: Province Island. [dostęp 2006-11-04]. Cytat: It is the largest island in Lake Memphremagog, being 77 acres, of which 7 acres, are in the United States.
ilec.or.jp
World Lakes Database: LAKE DRUKSIAI. International lakes environment committee. [dostęp 2006-12-10]. [zarchiwizowane z tego adresu (2012-03-06)]. Cytat: Number of main islands (name and area): Zamok (0.26 km²), Sosnovec (0.048 km²), Utovec (0.0088 km²) and 5 nameless islands.
jankrogh.com
geosite.jankrogh.com
Jan S. Krogh: Lake Druksiai. [dostęp 2006-12-10]. The international border is marked on the map.
World Lakes Database: LAKE DRUKSIAI. International lakes environment committee. [dostęp 2006-12-10]. [zarchiwizowane z tego adresu (2012-03-06)]. Cytat: Number of main islands (name and area): Zamok (0.26 km²), Sosnovec (0.048 km²), Utovec (0.0088 km²) and 5 nameless islands.