Analisis pengaruh tingkat return suku bunga, return nilai tukar, return pasar, return harga minyak dunia dan return harga gas alam terhadap return saham perusahaan subsektor crude petroleum natural gas production yang terdaftar di Bursa Efek Indonesia periode 2009-2014 = Analysis of the effect of interest rate return exchange rate, return market, return crude oil price return and natural gas price return on stock return of crude petroleum natural gas production companies listed in Indonesian Stock Exchange for period 2009-2014