Stewart, William A (1968). "A Sociolinguistic Typology for Describing National Multilingualism". प्रकाशित Fishman, Joshua A (संपा॰). Readings in the Sociology of Language. The Hague, Paris: Mouton. पपृ॰ 531–545. OCLC306499. p. 534.
jstor.org
Kloss, Heinz (1967). "'Abstand languages' and 'ausbau languages'". Anthropological Linguistics. 9 (7): 29–41. JSTOR30029461. p. 31.
worldcat.org
Stewart, William A (1968). "A Sociolinguistic Typology for Describing National Multilingualism". प्रकाशित Fishman, Joshua A (संपा॰). Readings in the Sociology of Language. The Hague, Paris: Mouton. पपृ॰ 531–545. OCLC306499. p. 534.