Gaya APA

hardiayatmo, H, C. (2017). Mekanika Tanah 1 (Ke 7). yogyakarta: gadjah mada university press.

Gaya MLA

hardiayatmo, Hary, Christady. "Mekanika Tanah 1". Ke 7 yogyakarta: gadjah mada university press, 2017. Text.