Introduction to the study of animal parasites and parasitism,

Mode of access: Internet.

Introduction to the study of animal parasites and parasitism,

Mode of access: Internet.

Introduction to the study of animal parasites and parasitism,

Mode of access: Internet.

A comparative study of methods of examining feces for evidences of parasitism.

"Originally issued April 20, 1911. Reissued, with addendda, May 21, 1912."

Das Schmarotzertum im Tierreich und seine Bedeutung für die Artbildung,

"Literatur," p. [125]-127.