Die Süsswasserfauna Deutschlands. Eine Exkursionsfauna - Brauer, August, 1863 -1917 (G. Fischer, 1909)

Das Süsswasserplankton; Methode und Resultate der quantitativen Untersuchung - Apstein, C. (Carl Heinrich), 1862 -1950 (Lipsius & Tischer, 1896)

Sveriges och Norges ryggradsdjur I. Däggdjuren - Lilljeborg, Wilhelm, 1816 -1908 (1871)

Syllogeus - National Museum of Natural Sciences (Canada) (National Museum of Natural Sciences, 1973)

Syllogeus - National Museum of Natural Sciences (Canada) (National Museum of Natural Sciences, 1981)

Syllogeus - National Museum of Natural Sciences (Canada) (National Museum of Natural Sciences, 1983)

Syllogeus - National Museum of Natural Sciences (Canada) (National Museum of Natural Sciences, 1985)

Syllogeus - National Museum of Natural Sciences (Canada) (National Museum of Natural Sciences, 1986)