@book{bhlpg39690949, title = {Journal of the Washington Academy of Sciences }, volume = {v.28 (1938)}, url = {https://www.biodiversitylibrary.org/page/39690949}, publisher = {Washington Academy of Sciences]}, author = {Washington Academy of Sciences (Washington, D.C.) }, year = {1938}, pages = {Page 196}, } @book{bhlpg7260898, title = {Monogenetic trematodes : their systematics and phylogeny }, url = {https://www.biodiversitylibrary.org/page/7260898}, publisher = {American Institute of Biological Sciences}, author = {Bykhovskiĭ, B. E. (Boris Evseevich), 1908 -1974}, year = {1961}, pages = {Page 600}, }