Helvering v. Gerhardt. Great Neck Publishing.
Chicago Style (17. basım) AtıfHelvering V. Gerhardt. Great Neck Publishing.
MLA (8th ed.) AtıfHelvering V. Gerhardt. Great Neck Publishing.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..
Helvering v. Gerhardt. Great Neck Publishing.
Chicago Style (17. basım) AtıfHelvering V. Gerhardt. Great Neck Publishing.
MLA (8th ed.) AtıfHelvering V. Gerhardt. Great Neck Publishing.