توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

IRELA. Trade between the member states of the European Community and Central America 1965-1986.Statistics. IRELA.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

IRELA. Trade Between the Member States of the European Community and Central America 1965-1986.Statistics. Madrid: IRELA.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

IRELA. Trade Between the Member States of the European Community and Central America 1965-1986.Statistics. IRELA.