Gaya APA

Selig, E.T.. (1981). Permanent Strain Behavior of Railroad Ballast . : A.A. Balkema.

Gaya Chicago

Selig, E.T.. Permanent Strain Behavior of Railroad Ballast. : A.A. Balkema, 1981. Computer Software.

Gaya MLA

Selig, E.T.. Permanent Strain Behavior of Railroad Ballast. : A.A. Balkema, 1981. Computer Software.

Gaya Turabian

Selig, E.T.. Permanent Strain Behavior of Railroad Ballast. : A.A. Balkema, 1981. Computer Software.