Gaya APA

de Heer, J. J.. (1981). Permissible Shaft Loads in Concrete Displacement Piles . : s.n..

Gaya Chicago

de Heer, J. J.. Permissible Shaft Loads in Concrete Displacement Piles. : s.n., 1981. Computer Software.

Gaya MLA

de Heer, J. J.. Permissible Shaft Loads in Concrete Displacement Piles. : s.n., 1981. Computer Software.

Gaya Turabian

de Heer, J. J.. Permissible Shaft Loads in Concrete Displacement Piles. : s.n., 1981. Computer Software.