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| Ayotte, Michael and Melinda Lamberty | Intelligibility testing of Bafia among Lefa speakers | 2002 | Journal of Language Survey Reports | Language Assessment, Sociolinguistics |
| Crawford, Karyn and Elaine Bombay | A Survey (RTT) of the Bambili-Bambui Language | 2007 | Journal of Language Survey Reports | Language Assessment, Sociolinguistics |
| Anderson, Heidi | Intelligibility testing (RTT) between Mendankwe and Nkwen | 2005 | Journal of Language Survey Reports | Language Assessment, Sociolinguistics |
| Stalder, Jürg | Sociolinguistic survey among the Xedi - Lamang | 1993 | | Language Assessment, Sociolinguistics |
| Stalder, Jürg | An assessment of intelligibility in the Ejagham community | 1989 | | Language Assessment, Sociolinguistics |
| Brye, Edward and Elizabeth Brye | Intelligibility testing survey of Bebe and Kemezung and synthesis of sociolinguistic research of the Eastern Beboid cluster | 2004 | Journal of Language Survey Reports | Language Assessment, Sociolinguistics |
