Gender parity index:
Country's gender parity index in primary, or elementary, school. For countries with a rating of over 1, more females are enrolled while countries with a rating under 1 have more males enrolled.
"Bulgaria Elementary (primary) school Stats", NationMaster. Retrieved from http://www.nationmaster.com/country-info/profiles/Bulgaria/Education/Elementary-(primary)-school
"Bulgaria Elementary (primary) school Stats, NationMaster." 1990-2011. <http://www.nationmaster.com/country-info/profiles/Bulgaria/Education/Elementary-(primary)-school>.
'Bulgaria Elementary (primary) school Stats, NationMaster', <http://www.nationmaster.com/country-info/profiles/Bulgaria/Education/Elementary-(primary)-school> [assessed 1990-2011]
"Bulgaria Elementary (primary) school Stats, NationMaster," http://www.nationmaster.com/country-info/profiles/Bulgaria/Education/Elementary-(primary)-school (assessed 1990-2011)
"Bulgaria Elementary (primary) school Stats", NationMaster, http://www.nationmaster.com/country-info/profiles/Bulgaria/Education/Elementary-(primary)-school (last visited 1990-2011)
"Bulgaria Elementary (primary) school Stats", NationMaster, http://www.nationmaster.com/country-info/profiles/Bulgaria/Education/Elementary-(primary)-school (as of 1990-2011)