توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Northwestern University (Evanston, Ill.). (1918). John Harper Long, 1856-1918: Professor of chemistry in Northwestern University, 1881-1918. Northwestern University.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Northwestern University (Evanston, Ill.). John Harper Long, 1856-1918: Professor of Chemistry in Northwestern University, 1881-1918. [Evanston, Ill: Northwestern University, 1918.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Northwestern University (Evanston, Ill.). John Harper Long, 1856-1918: Professor of Chemistry in Northwestern University, 1881-1918. Northwestern University, 1918.