English modal auxiliary verbs (English Wikipedia)

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Coats (2023), p. 2. Coats, Steven (December 2023). "Double modals in contemporary British and Irish speech" (PDF). English Language and Linguistics. 27 (4): 693–718. doi:10.1017/S1360674323000126.
Lebedeva & Orlova (2019), pp. 71–84. Lebedeva, Irina S.; Orlova, Svetlana N. (2019). "Semantics and pragmatics of the double modal 'might could'". Training, Language and Culture. 3 (2): 71–84. doi:10.29366/2019tlc.3.2.5 – via Cyberleninka.
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ecenglish.com

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Morin & Grieve (2024), pp. 11–13. Morin, Cameron; Grieve, Jack (2024). "The semantics, sociolinguistics, and origins of double modals in American English: New insights from social media". PLOS ONE. 19 (1): e0295799. Bibcode:2024PLoSO..1995799M. doi:10.1371/journal.pone.0295799. PMC 10807846. PMID 38265988.

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jstor.org

Di Paolo (1989), p. 195. Di Paolo, Marianna (1989). "Double modals as single lexical items". American Speech. 64 (3): 195–224. doi:10.2307/455589. JSTOR 455589.

mises.org

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ncbi.nlm.nih.gov

Morin & Grieve (2024), pp. 11–13. Morin, Cameron; Grieve, Jack (2024). "The semantics, sociolinguistics, and origins of double modals in American English: New insights from social media". PLOS ONE. 19 (1): e0295799. Bibcode:2024PLoSO..1995799M. doi:10.1371/journal.pone.0295799. PMC 10807846. PMID 38265988.

pubmed.ncbi.nlm.nih.gov

Morin & Grieve (2024), pp. 11–13. Morin, Cameron; Grieve, Jack (2024). "The semantics, sociolinguistics, and origins of double modals in American English: New insights from social media". PLOS ONE. 19 (1): e0295799. Bibcode:2024PLoSO..1995799M. doi:10.1371/journal.pone.0295799. PMC 10807846. PMID 38265988.

oulu.fi

oulurepo.oulu.fi

Coats (2023), pp. 11, 17. Coats, Steven (December 2023). "Double modals in contemporary British and Irish speech" (PDF). English Language and Linguistics. 27 (4): 693–718. doi:10.1017/S1360674323000126.
Coats (2023), p. 2. Coats, Steven (December 2023). "Double modals in contemporary British and Irish speech" (PDF). English Language and Linguistics. 27 (4): 693–718. doi:10.1017/S1360674323000126.

studyspanish.com

StudySpanish (n.d.). "The Conditional Tense". Study Spanish. n.d.

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ultralingua.com

Ultralingua (n.d.). "Conditional tense". UltraLingua Online Dictionary & Grammar. n.d. Archived from the original on 2009-10-11.

web.archive.org

Koltai (2013). Koltai, Anastasia (February 21, 2013). "English Grammar: Usage of Shall vs Should with Examples". My English Teacher. Archived from the original on February 24, 2013.
Learn English (n.d.). "Modals – deduction (present)". Learn English. British Council. n.d. Archived from the original on 2014-12-15.

worldcat.org

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Levine (2012), pp. 187–204. Levine, Robert D. (2012). "Auxiliaries: To's company". Journal of Linguistics. 48 (1): 187–203. doi:10.1017/S002222671100034X. ISSN 0022-2267.
Poutsma (1929), p. 61. Poutsma, H. (1929). A Grammar of Late Modern English (PDF). Vol. 1 (2nd ed.). Groningen: P. Noordhoff. p. 158. OCLC 697774306 – via Internet Archive.
Masefield (1912), ^{[page needed]}. Masefield, John (1912). The Widow in the Bye Street. London: Sidgwick & Jackson. OCLC 330395 – via Gutenberg Project.
Poutsma (1929), p. 158. Poutsma, H. (1929). A Grammar of Late Modern English (PDF). Vol. 1 (2nd ed.). Groningen: P. Noordhoff. p. 158. OCLC 697774306 – via Internet Archive.