@article {244,
	title = {The structure and affinities of Herdmania claviformis, the type of a new genus and family of ascidians},
	journal = {Mark Anniversary Volume},
	volume = {12},
	year = {1903},
	pages = {235-261},
	author = {Ritter, W.E.}
}
@article {136,
	title = {Papers from the Harriman Alaska Expedition. XXIII. The Ascidians},
	journal = {Proceedings of the Washington Academy of Sciences},
	volume = {3},
	year = {1901},
	pages = {225-266},
	chapter = {225},
	author = {Ritter, W.E.}
}
@article {400,
	title = {Some ascidians from Puget Sound. Collections of 1896},
	journal = {Annals. New York Academy of Science},
	volume = {12},
	number = {14},
	year = {1900},
	pages = {589-616},
	author = {Ritter, W.E.}
}
@inbook {121,
	title = {A contribution to the knowledge of the tunicates of the Pribilof Islands},
	booktitle = {Fur seals and fur-seal islands of the north Pacific Ocean, Washington},
	volume = {3},
	year = {1899},
	pages = {511-537},
	author = {Ritter, W.E.}
}
@article {420,
	title = {Notes on the structure and development of the type of a new family of so-called social ascidians from the coast of California},
	journal = {Science, new series},
	volume = {5},
	year = {1896},
	pages = {434-435},
	author = {Ritter, W.E.}
}
@article {409,
	title = {Tunicata of the Pacific coast of North America},
	journal = {Proceedings of the California Academy of Sciences, series 2},
	volume = {4},
	year = {1893},
	pages = {37-80},
	author = {Ritter, W.E.}
}
@article {129,
	title = {Ascidians of the littoral zone of southern California},
	journal = {University of California Publications in Zoology},
	volume = {16 (24)},
	year = {1917},
	pages = {439-512},
	chapter = {439},
	author = {Ritter, W.E. and Forsyth, R.A.}
}
@article {423,
	title = {The simple ascidians from the north-eastern Pacific in the collection of the United States National Museum},
	journal = {Proceedings of the United States National Museum},
	volume = {45},
	year = {1913},
	pages = {427-505},
	author = {Ritter, W.E.}
}
@article {130,
	title = {The ascidians collected by the United States Fisheries Bureau Steamer Albatross on the coast of California during the Summer of 1904},
	journal = {University of California Publications in Zoology},
	volume = {4(1)},
	year = {1907},
	pages = {1-52},
	chapter = {1},
	author = {Ritter, W.E.}
}
