Gaya APA

Harrigan, E, T. (2007). Effects of Subsurface Drainage on Pavement Performance: Analysis of the SPS-1 and SPS-2 Field Sections . Washington: TRB.

Gaya MLA

Harrigan, Edward, T.. "Effects of Subsurface Drainage on Pavement Performance: Analysis of the SPS-1 and SPS-2 Field Sections". Washington: TRB, 2007. Text.