Multibahasa (Indonesian Wikipedia)

Tucker, G. Richard. "A Global Perspective on Bilingualism and Bilingual Education (1999)". Universitas Carnegie Mellon. Diarsipkan dari versi asli tanggal 22 Agustus 2012. Diakses tanggal 16 Desember 2013.

cambridgescholars.com

Mauranen, Anna; Ranta, Elina (2009). English as a Lingua Franca: Studies and Findings. Newcastle: Cambridge Scholars Publishing. ISBN 978-1-4438-1296-2. Diarsipkan dari versi asli tanggal 2019-09-18. Diakses tanggal 2020-09-19.

"English as a second language: Top 10 English Speaking Countries". Europe Language Jobs (dalam bahasa Inggris). Diakses tanggal 17 September 2020.

Cook, Vivian (2008). Second Language Learning and Language Teaching (dalam bahasa Inggris). Hodder Education. ISBN 978-0-340-95876-6.
McArthur, Thomas Burns; McArthur, Tom; McArthur, Roshan (2005). Concise Oxford Companion to the English Language (dalam bahasa Inggris). Oxford University Press. hlm. 894. ISBN 978-0-19-280637-6.
Luckyj, George S. N. (1990). Literary Politics in the Soviet Ukraine, 1917-1934 (dalam bahasa Inggris). Duke University Press. hlm. 25. ISBN 978-0-8223-1099-0.
Heine, Bernd; Nurse, Derek (2000-08-03). African Languages: An Introduction (dalam bahasa Inggris). Cambridge University Press. ISBN 978-0-521-66629-9.

Weltens, Bert; Cohen, Andrew D. (1989). "LANGUAGE ATTRITION RESEARCH: An Introduction". Studies in Second Language Acquisition. 11 (2): 127–133. ISSN 0272-2631.
Minority Languages, National Languages, and Official Language Policies. McGill-Queen's University Press. 2018. ISBN 978-0-7735-5493-1.
Hudson, Alan (1992). "Diglossia: A Bibliographic Review". Language in Society. 21 (4): 611–674. ISSN 0047-4045.

"The importance of multilingualism". ELBES Multilingual Communication. Diakses tanggal 16 September 2010.

Feldman, Robert S.; Hupp; Jewell (2020). A Topical Approach to Life-Span Development (4th ed. New York: McGraw-Hill Companies, Inc. hlm. 330–335. ISBN 978-0-07-803550-0.

Limacher, Ute (2019-05-29). "Simultaneous and Sequential Bilingualism". Ute's International Lounge (dalam bahasa Inggris). Diakses tanggal 2020-09-17.

"Multi-competence definition". Vivian Cook. Diakses tanggal 17 September 2020.

Tucker, G. Richard. "A Global Perspective on Bilingualism and Bilingual Education (1999)". Universitas Carnegie Mellon. Diarsipkan dari versi asli tanggal 22 Agustus 2012. Diakses tanggal 16 Desember 2013.
"The Cult of the Polyglot - LATG". web.archive.org. 2016-09-06. Archived from the original on 2016-09-06. Diakses tanggal 2020-09-19. Pemeliharaan CS1: Url tak layak (link)
Mauranen, Anna; Ranta, Elina (2009). English as a Lingua Franca: Studies and Findings. Newcastle: Cambridge Scholars Publishing. ISBN 978-1-4438-1296-2. Diarsipkan dari versi asli tanggal 2019-09-18. Diakses tanggal 2020-09-19.

Kaplan, Robert B. (1966). "Cultural Thought Patterns in Inter-Cultural Education". Language Learning (dalam bahasa Inggris). 16 (1-2): 1–20. doi:10.1111/j.1467-1770.1966.tb00804.x. ISSN 1467-9922.
Weltens, Bert; Cohen, Andrew D. (1989). "LANGUAGE ATTRITION RESEARCH: An Introduction". Studies in Second Language Acquisition. 11 (2): 127–133. ISSN 0272-2631.
Hudson, Alan (1992). "Diglossia: A Bibliographic Review". Language in Society. 21 (4): 611–674. ISSN 0047-4045.