This particular section appears to have been written in 2000 R.J. Forbes (1958), Studies in Early Petroleum History, Leiden, Netherlands: E.J. Brill, pp.  24, retrieved 10 June 2010 Salmon, William (1673).
This particular section appears to have been written in 2000 R.J. Forbes (1958)، Studies in Early Petroleum History، لايدن, Netherlands: E.J. Brill، صفحة 24، اطلع عليه بتاريخ 10 يونيو 2010  Salmon، William (1673).