Gaya APA

John, C, L., A., J, M, M. (1991). The valuation of natural resources: evidence from oil and gas pure plays . United Kingdom: Blackwell Journals.

Gaya MLA

John, Crain, L.., A., Jamal, M., M.. "The valuation of natural resources: evidence from oil and gas pure plays". United Kingdom: Blackwell Journals, 1991. Artikel.