توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Howell, H. H. (1859). The geology of the Warwickshire coal-field: And the Permian rocks and Trias of the surrounding district. Longman, Green, Longman, and Roberts.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Howell, Henry Hyatt. The Geology of the Warwickshire Coal-field: And the Permian Rocks and Trias of the Surrounding District. London: Longman, Green, Longman, and Roberts, 1859.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Howell, Henry Hyatt. The Geology of the Warwickshire Coal-field: And the Permian Rocks and Trias of the Surrounding District. Longman, Green, Longman, and Roberts, 1859.