All modern classifications of Ekoid are based on Crabb ( 1969 ) .
When Watters ( 1981 ) came to explore the proto - phonology of Ekoid , he used this source , rather than his own field material from the Ejagham dialects in Cameroon .
All modern classifications of Ekoid are based on Crabb ( 1969 ) and when Watters ( 1981 ) came to explore the proto - phonology of Ekoid , he used this source , rather than his own field material from the Ejagham dialects in Cameroon .