Horner, P. C. (1981). Earthworks. Telford.
Cita Chicago (17th ed.)Horner, P. C. Earthworks. London: Telford, 1981.
Cita MLA (8th ed.)Horner, P. C. Earthworks. Telford, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)