توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Sobel, D. (1996). Longitude: The true story of a lone genius who solved the greatest scientific problem of his time. Fourth Estate.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Sobel, Dava. Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time. London: Fourth Estate, 1996.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Sobel, Dava. Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time. Fourth Estate, 1996.