Kesediaan membayar (willingness to pay) retribusi pelayanan persampahan kebersihan hunian apartemen di Provinsi DKI Jakarta per unit per bulan = willingness to pay waste cleaning services retribution residential apartment in Province of DKI Jakarta per unit per month

Analisis kualitatif pengendalian kritikal perusahaan tambang batubara PT X di Kalimantan Tengah = Qualitative analysis of critical controls on a coal mining company PT X in Central Kalimantan

Pengelolaan air asam tambang kegiatan pertambangan batubara terbuka dan kemungkinan dampak pada kesehatan kulit masyarakat pemanfaat sungai (suatu kajian di PT. X, Kabupaten Murung Raya, Provinsi Kalimantan Tengah) = Acid mine drainage management of open pit coal mining activities and possibility impact on skin health of river water-users community (a study in PT. X, Murung Raya District ,Central Kalimantan Province) / Rio Febrianto

Kesediaan Membayar (Willingness To Pay) Biaya Eksternal pada Layanan Last Mile Delivery (Studi Kasus: DKI JAKARTA) = Willingness to Pay the External Cost for Last Mile Delivery Services (Study Case: DKI Jakarta)

Pemodelan dan estimasi sumberdaya batubara Daerah X, Kalimantan Tengah = Modelling and estimating of coal resources in X Area, Central Kalimantan Province