Goodnight، C. J.؛ Stevens، L. (1997). "Experimental studies of group selection: What do they tell us about group selection in nature". American Naturalist. ج. 150: S59–S79. DOI:10.1086/286050. PMID:18811313.
Goodnight، C. J.؛ Stevens، L. (1997). "Experimental studies of group selection: What do they tell us about group selection in nature". American Naturalist. ج. 150: S59–S79. DOI:10.1086/286050. PMID:18811313.