توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Institution of Civil Engineers(Great Britain). (1989). Specification for ground investigation with Bill of quantities. Thomas Telford.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Institution of Civil Engineers(Great Britain). Specification for Ground Investigation with Bill of Quantities. London: Thomas Telford, 1989.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Institution of Civil Engineers(Great Britain). Specification for Ground Investigation with Bill of Quantities. Thomas Telford, 1989.