Graf, T.; Simmons, C. T. (February 2009). "Variable-density groundwater flow and solute transport in fractured rock: Applicability of the Tang et al. [1981] analytical solution". Water Resources Research. 45 (2): W02425. Bibcode:2009WRR....45.2425G. doi:10.1029/2008WR007278.
Tang, Q.; Gao, H.; Lu, H.; Lettenmaier, D. P. (6 Oktober 2009). "Remote sensing: hydrology". Progress in Physical Geography. 33 (4): 490. doi:10.1177/0309133309346650.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
Reddy, P. Jaya Rami (2005-12). A Text Book of Hydrology (dalam bahasa Inggris). Firewall Media. hlm. 252. ISBN978-81-7008-099-2.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan); Periksa nilai tanggal di: |date= (bantuan)
Graf, T.; Simmons, C. T. (February 2009). "Variable-density groundwater flow and solute transport in fractured rock: Applicability of the Tang et al. [1981] analytical solution". Water Resources Research. 45 (2): W02425. Bibcode:2009WRR....45.2425G. doi:10.1029/2008WR007278.