APA

Transportation Research Record nr 581, . (1976). Innovations in subsurface exploration of soils. Washington DC: Transportation Research Record nr 581.

Chicago

Transportation Research Record nr 581, . 1976. Innovations in subsurface exploration of soils. Washington DC: Transportation Research Record nr 581.

Harvard

Transportation Research Record nr 581, . (1976). Innovations in subsurface exploration of soils. Washington DC: Transportation Research Record nr 581.

MLA

Transportation Research Record nr 581, . Innovations in subsurface exploration of soils. Washington DC: Transportation Research Record nr 581. 1976.