Garp, (2009).Foundations of Energy Risk Management: An Overview of the Energy Sector And Its Physical And Financial Markets .Kebumen:cara budidaya termasuk pemeliharaan.
Gaya MLA
Garp, .Foundations of Energy Risk Management: An Overview of the Energy Sector And Its Physical And Financial Markets.Kebumen:cara budidaya termasuk pemeliharaan,2009.Text.