HUISMAN, H. (1987). Regional and rural development planning series Nr.IX: Metode penelitian. F.Geografi-UGM.
Lua i Stíl Chicago (17ú heag.)HUISMAN, Henk. Regional and Rural Development Planning Series Nr.IX: Metode Penelitian. Yogyakarta: F.Geografi-UGM, 1987.
Lua MLA (9ú heag.)HUISMAN, Henk. Regional and Rural Development Planning Series Nr.IX: Metode Penelitian. F.Geografi-UGM, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.