A simplified grammar of the Polish language
MLA
Morfill, William Richard, 1834-1909. A simplified grammar of the Polish language. 1884.. https://collections.library.yale.edu/catalog/30706980.
APA, 6th edition
Morfill, William Richard, 1834-1909. (1884.)[A simplified grammar of the Polish language]. https://collections.library.yale.edu/catalog/30706980.