C. P. Hill & Edgar C. Polome 
Routledge Revivals: Language in Tanzania (1980) [PDF ebook] 

Originally published in 1980, Language in Tanzania presents a comprehensive overview of the Survey of Language Use and Language Teaching in Eastern Africa. Using extensive research carried out by an interdisciplinary group of international and local scholars, the survey also covers Ethiopia, Kenya, Uganda and Zambia. The book represents one of the most in-depth sociolinguistic studies carried out on this region at this time. It provides basic linguistic data necessary to policy-makers, administrators, and educators, and will be of interest to those researching the formulation and execution of language policy.