^Richard Durbin (1998). Biological Sequence Analysis: Probabilistic Models of Proteins and Nucleic AcidsISBN 9780521629713 (revised Nov 2015)
^Richard Durbin , Sean R. Eddy , Anders Krogh , Graeme Mitchison (2015). Biological Sequence Analysis: Probabilistic Models of Proteins and Nucleic AcidsBiggerBooks. ISBN 9780521629713 (revised Nov 2023)