Boolean data type (English Wikipedia)

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"Report on the Algorithmic Language ALGOL 68, Section 10.2.2" (PDF). August 1968. Archived (PDF) from the original on 6 April 2008. Retrieved 30 April 2007.
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"PEP 285 -- Adding a bool type". 4 May 2011. Archived from the original on 28 March 2018. Retrieved 28 March 2018.
van Rossum, Guido (3 April 2002). "PEP 285 -- Adding a bool type". Archived from the original on 1 May 2013. Retrieved 15 May 2013.
"Expressions". Python v3.3.2 documentation. Archived from the original on 22 May 2013. Retrieved 15 May 2013.
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"PostgreSQL: Documentation: 10: 8.6. Boolean Type". www.postgresql.org. Archived from the original on 9 March 2018. Retrieved 1 May 2018.
"MySQL :: MySQL 8.0 Reference Manual :: 12.1.1 Numeric Type Overview". dev.mysql.com. Archived from the original on 2016-09-22.
"ECMAScript Language Specification" (PDF). p. 43. Archived from the original (PDF) on 2015-04-12. Retrieved 2011-03-12.
"The Elements of JavaScript Style". Douglas Crockford. Archived from the original on 17 March 2011. Retrieved 5 March 2011.