MLA

Jonáš, Karel, 1840-1896. Bohemian made easy. A practical Bohemian course for English-speaking people. 1890.. https://collections.library.yale.edu/catalog/30921816.

APA, 6th edition

Jonáš, Karel, 1840-1896. (1890.)[Bohemian made easy. A practical Bohemian course for English-speaking people]. https://collections.library.yale.edu/catalog/30921816.