توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Leppan, H. D. (1928). The agricultural development of arid and semi-arid regions: With special reference to South Africa. Central News Agency.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Leppan, Hubert Dudley. The Agricultural Development of Arid and Semi-arid Regions: With Special Reference to South Africa. [Pretoria?] South Africa: Central News Agency, 1928.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Leppan, Hubert Dudley. The Agricultural Development of Arid and Semi-arid Regions: With Special Reference to South Africa. Central News Agency, 1928.