توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Opperman, E. B. (1965). The potential usefulness of uniform tax burden distributions as measures of the tax capacities and tax efforts of the State and local governments; an empirical study. s.n.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Opperman, Edward Belz. The Potential Usefulness of Uniform Tax Burden Distributions as Measures of the Tax Capacities and Tax Efforts of the State and Local Governments; an Empirical Study. [Bloomington]: s.n, 1965.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Opperman, Edward Belz. The Potential Usefulness of Uniform Tax Burden Distributions as Measures of the Tax Capacities and Tax Efforts of the State and Local Governments; an Empirical Study. s.n, 1965.