Strens, R. G. J. (2009). "The Graphite Deposit of Seathwaite in Borrowdale, Cumberland". Geological Magazine. 102 (5): 393–406. doi:10.1017/S0016756800053668. S2CID129924824.
Strens, R. G. J. (2009). "The Graphite Deposit of Seathwaite in Borrowdale, Cumberland". Geological Magazine. 102 (5): 393–406. doi:10.1017/S0016756800053668. S2CID129924824.