Dipayanti, Kris and Agrasadya, Agrasadya and Apriansyah, Muger Riset Pemasaran. Unpam Press. ISBN 978-623-6352-64-9
Ramdani, Edon and Nazar, Shinta Ningtiyas TEORI PORTOFOLIO DAN INVESTASI. Unpam Press. ISBN 978-623-6352-55-7
