Griffiths, Anthony J. F.; Miller, Jeffrey H.; Suzuki, David T. et al., eds (2000). "Variation and its modulation". An Introduction to Genetic Analysis (7th ed.). New York: W. H. Freeman. ISBN0-7167-3520-2.
Griffiths, Anthony J. F.; Miller, Jeffrey H.; Suzuki, David T. et al., eds (2000). "Selection". An Introduction to Genetic Analysis (7th ed.). New York: W. H. Freeman. ISBN0-7167-3520-2. .section.3886.
Griffiths, Anthony J. F.; Miller, Jeffrey H.; Suzuki, David T. et al., eds (2000). "Random events". An Introduction to Genetic Analysis (7th ed.). New York: W. H. Freeman. ISBN0-7167-3520-2