Alfred A. Post, Comprehensive Volapük Grammar (1890)
“ NOUN. Is of one uniform declension in four cases: nominative (subject) ; genitive (possessive) ; dative (indirect objective) ; accusative (direct objective) ; thus— Every noun in the language follows this declension; i. e. the nominative is changed by a, e, and i to the genitive, dative, and accusative respectively, and s added to each case gives its plural. (See page 33.) PRONOUNS. (a) Personal. (These follow the declension of nouns, and ol (thou) should be used when a single person is meant.) ”
