Sipma, Pieter. 1913. Phonology &grammar of modern West Frisian; with phonetic texts and glossary. Oxford University Press. 194pp.
@book{318827, author = {Sipma, Pieter}, pages = {194}, publisher = {Oxford University Press}, title = {Phonology &grammar of modern West Frisian; with phonetic texts and glossary}, year = {1913} }