อ้างอิง ของ ธงชาติโปรตุเกส

  1. 1 2 "Decreto que aprova a Bandeira Nacional". Símbolos Nacionais (in Portuguese). Portal do Governo. สืบค้นเมื่อ 2007-02-18.CS1 maint: Unrecognized language (link) [ลิงก์เสีย]
  • Coelho, Trindade (1908). Manual político do cidadão portuguêz (in Portuguese) (2nd ed. ed.). Porto: Emprésa Litteraria e Typographica. OCLC 6129820.CS1 maint: Unrecognized language (link) CS1 maint: Extra text (link)
  • Pinheiro, Columbano Bordalo. Bandeira Nacional: Modelo approvado pelo Governo Provisorio da Republica Portuguesa (in Portuguese) (1st ed. ed.). Lisbon: Imprensa Nacional. OCLC 24780919.CS1 maint: Unrecognized language (link) CS1 maint: Extra text (link)