MLA

The Grebo Hymn Book. Press of the A.B.C.F. mission, 1839. https://collections.library.yale.edu/catalog/32553162.

APA, 6th edition

The Grebo hymn book. (1839). [Texts]. Press of the A.B.C.F. mission. https://collections.library.yale.edu/catalog/32553162.