Citazione Stile APA (7a Edizione)

Hoek, E., & Bray, J. (1981). Rock slope engineering (3rd rev. ed.). E & FN Spon for the Institution of Mining & Metallurgy.

Citazione stile Chigago Style (17a edizione)

Hoek, Evert, e John Bray. Rock Slope Engineering. 3rd rev. ed. London: E & FN Spon for the Institution of Mining & Metallurgy, 1981.

Citatione MLA (9a ed.)

Hoek, Evert, e John Bray. Rock Slope Engineering. 3rd rev. ed. E & FN Spon for the Institution of Mining & Metallurgy, 1981.