Aquatic plants of Illinois; an illustrated manual including species submersed, floating, and some of shallow water and muddy shores

Bibliography: p. 129-132.

Aquatic plants of the Pacific Northwest, with vegetative keys,

Mode of access: Internet.

Aquatic plants of the Pacific Northwest, with vegetative keys

Mode of access: Internet.

Annales de biologie lacustre

Mode of access: Internet.

Die Süsswasser-Flora Deutschlands, Österreichs und der Schweiz /

Title of later volumes and of second editions of earlier volumes changed to Die Süsswasser-Flora Mitteleuropas. 1930.

Ponds and ditches.

Mode of access: Internet.