APA (7th ed.) Citation
Werner, A., & Ross, E. D. (1925). The Language-families of Africa: 2. ed. with a preface by E. Denison Ross and a map.
Chicago Style (17th ed.) Citation
Werner, Alice, and E. Denison Ross. The Language-families of Africa: 2. Ed. with a Preface by E. Denison Ross and a Map. London, 1925.
MLA (9th ed.) Citation
Werner, Alice, and E. Denison Ross. The Language-families of Africa: 2. Ed. with a Preface by E. Denison Ross and a Map. 1925.
Warning: These citations may not always be 100% accurate.