Gaya APA

PETRIE, G., KENNIE, T. (1991). TERRAIN MODELLING IN SURVEYING AND CIVIL ENGINEERING . New York: MC GRAW HILL.

Gaya MLA

PETRIE, G.., KENNIE, T.J.M.. "TERRAIN MODELLING IN SURVEYING AND CIVIL ENGINEERING". New York: MC GRAW HILL, 1991. Text.