APA

Henn R. W., . (2003). AUA guidelines for backfilling and contact grouting of tunnels ans shafts. United States: Asce Press.

Chicago

Henn Raymond W, . 2003. AUA guidelines for backfilling and contact grouting of tunnels ans shafts. United States: Asce Press.

Harvard

Henn R. W., . (2003). AUA guidelines for backfilling and contact grouting of tunnels ans shafts. United States: Asce Press.

MLA

Henn Raymond W, . AUA guidelines for backfilling and contact grouting of tunnels ans shafts. United States: Asce Press. 2003.