References
- Anderson , S. R. 2005 . How many languages are there in the world? , Washington, D.C. : Answer to a FAQ by the Linguistic Society of America . Retrieved 1 September 2005 from http://www.lsadc.org/pdf_files/howmany.pdf
- Comrie B. 1987 The World's Major Languages London Croom Helm
- Garey , M. R. and Johnson , D. S. 1979 . Computers and Intractability: A Guide to the Theory of NP-Completeness , New York : W. H. Freeman .
- Gordon R. G. Jr. 2005 Ethnologue: Languages of the World, , 15th edition Dallas SIL International
- Heap , D. 2006 . “ Dialect chains ” . In Encyclopedia of Language and Linguistics , 2nd edition , Edited by: Brown , K. Vol. 3 , 528 – 530 . Amsterdam : Elsevier .
- Heine , B. and Köhler , O. 1981 . Linguistik - Ostafrika (Kenya, Uganda, Tanzania): Gliederung der Sprachen und Dialekte. Afrika-Kartenwerk E 10 , Berlin : Gebrüder Borntraeger .
- Heine , B. and Nurse , D. 2000 . “ Introduction ” . In African Languages: An Introduction , Edited by: Heine , B. and Nurse , D. 1 – 10 . Cambridge : Cambridge University Press .
- Hockett , C. F. 1958 . A Course in Modern Linguistics , Toronto : Macmillan .
- Jones , A. A. 1998 . Towards a Lexicogrammar of Mekeo (An Austronesian Language of West Central Papua). Volume 138 of Pacific Linguistics: Series C , Canberra : Research School of Pacific and Asian Studies, Australian National University .
- Lynch , J. and Crowley , T. 2001 . Languages of Vanuatu: A New Survey and Bibliography. Volume 517 of Pacific Linguistics , Canberra : Research School of Pacific and Asian Studies, Australian National University .
- Polomé , E. C. 1980 . “ The languages of Tanzania ” . In Language in Tanzania , Edited by: Polomé , E. C. and Hill , C. P. 1 – 25 . Ford Foundation Language Surveys, Oxford University Press .
- Read , R. C. 1968 . An introduction to chromatic polynomials . Journal of Combinatorial Theory , 4 : 52 – 71 .
- Stanley , R. P. 1997 . Enumerative Combinatorics: Volume I. Volume 49 of Cambridge Studies in Advanced Mathematics , Cambridge : Cambridge University Press .