APA

Hoffman G., Malasheskie G., . (1976). Laboratory evaluation of pertinent materials and design characteristics of PennDOT's underdrain system. Harrisburg, PA: Pennsylvania Department of Transportation. Bureau of Materials, Testing and Research. RR.

Chicago

Hoffman GL, Malasheskie G, . 1976. Laboratory evaluation of pertinent materials and design characteristics of PennDOT's underdrain system. Harrisburg, PA: Pennsylvania Department of Transportation. Bureau of Materials, Testing and Research. RR.

Harvard

Hoffman G., Malasheskie G., . (1976). Laboratory evaluation of pertinent materials and design characteristics of PennDOT's underdrain system. Harrisburg, PA: Pennsylvania Department of Transportation. Bureau of Materials, Testing and Research. RR.

MLA

Hoffman GL, Malasheskie G, . Laboratory evaluation of pertinent materials and design characteristics of PennDOT's underdrain system. Harrisburg, PA: Pennsylvania Department of Transportation. Bureau of Materials, Testing and Research. RR. 1976.