1. An Introduction to Marine Ecology;Barnes,1988
2. An ordination of the upland forest communities of Southern Wisconsin;Bray;Ecol. Monogr.,1957
3. Estuaries;Cameron,1963
4. Carr, M.R., Carter, R.G., Clarke, K.R., 1993. User guide to PRIMER v.4.0 (Plymouth Routines in Multivariate Ecological Research). Plymouth Marine Laboratory, Plymouth, 53 pp.
5. Introduction to Multivariate Analysis;Chatfield,1980