1980Five Co-occurring Factors in Speaking Proficiency. In James R. Frith (ed.), Measuring Spoken Language Proficiency. Washington, DC: Foreign Service Institute, 1–6.
Adams, Marianne L. and James R. Frith
(eds.)1979Testing Kit: French and Spanish. Washington, DC: Foreign Service Institute.
Fishman, Joshua A.
1965Who Speaks What Language to Whom and When?La Linguistique 21: 67–68.
Gal, Susan
1979Language Shift: Social Determinants of Linguistic Change in Bilingual Austria. New York: Academic Press.
Gonzalez, Andrew B. and Ma. Lourdes S. Bautista
1986Language Surveys in the Philippines (1966–1984). Manila: De La Salle University Press.
Milroy, Lesley
1980Language and Social Networks. Oxford: Basil Blackwell.