BCP is a persistent name for a series of IETF Request for Comments (RFCs) whose numbers change as they are updated. As of 2015-05-28, the latest included RFC about the principles of language tags is RFC 5646, Tags for the Identification of Languages.
lisa.org
"What is Globalization?". LISA. Romainmôtier, Switzerland: Localization Industry Standards Association. Archived from the original on January 1, 2011. Retrieved 6 September 2010.
Crosignani, Simone; Ballista, Andrea; Minazzi, Fabio (October–November 2008). "Preserving the spell in games localization". MultiLingual. Sandpoint, Idaho: MultiLingual Computing. Archived from the original on 2015-05-01. Retrieved 2008-10-31.
drepper (18 February 2007). "libc/localedata/SUPPORTED - view - 1.102". sources.redhat.com. Red Hat. Retrieved 6 September 2010. (List of supported locales in the GNU libc library.)
"What is Globalization?". LISA. Romainmôtier, Switzerland: Localization Industry Standards Association. Archived from the original on January 1, 2011. Retrieved 6 September 2010.
Crosignani, Simone; Ballista, Andrea; Minazzi, Fabio (October–November 2008). "Preserving the spell in games localization". MultiLingual. Sandpoint, Idaho: MultiLingual Computing. Archived from the original on 2015-05-01. Retrieved 2008-10-31.