Langa, P. V. (2014). Higher Education in Portuguese Speaking African Countries: Higher Education in Portuguese Speaking African Countries. Project Muse.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Langa, Patrício Vitorino. Higher Education in Portuguese Speaking African Countries: Higher Education in Portuguese Speaking African Countries. Baltimore, Maryland: Project Muse, 2014.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Langa, Patrício Vitorino. Higher Education in Portuguese Speaking African Countries: Higher Education in Portuguese Speaking African Countries. Project Muse, 2014.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.