▁society ▁and ▁the ▁state ▁in ▁which ▁they ▁exist ▁are ▁heavily ▁influ ential ▁on ▁the ▁way ▁people ▁class ify ▁things . ▁ ▁Br ief ▁bibli ography ▁of ▁works ▁ ▁Books ▁published ▁ ▁Roy ▁Ellen ' s ▁published ▁books ▁include : ▁▁ ▁EL LE N , ▁Roy ▁( 1 9 7 8 ) ▁N ua ulu ▁settlement ▁and ▁e col ogy . ▁The ▁environmental ▁relations ▁of ▁an ▁eastern ▁Indones ian ▁community . ▁No . 8 3 ▁Martin us ▁N ij hoff : ▁The ▁H ague . ▁ ▁EL LE N , ▁Roy ▁( 1 9 8 2 ) ▁Environment , ▁subs istence ▁and ▁system : ▁the ▁e col ogy ▁of ▁small - scale ▁social ▁form ations . ▁Cambridge : ▁Cambridge ▁University ▁Press . ▁ ▁EL LE N , ▁Roy ▁( 1 9 9 3 ) ▁The ▁cultural ▁relations ▁of ▁classification : ▁an ▁analysis ▁of ▁N ua ulu ▁animal ▁categories ▁from ▁central ▁Ser am . ▁Cambridge ▁: ▁Cambridge ▁University ▁Press . ▁ ▁EL LE N , ▁Roy ▁( 1 9 9 3 ) ▁N ua ulu ▁eth no zo ology ▁: ▁a ▁system atic ▁invent ory . ▁Can ter bury : ▁Centre ▁for ▁Social ▁Anth rop ology ▁and ▁Comput ing , ▁University ▁of ▁Kent ▁at ▁Can ter bury ▁in ▁co - operation ▁with ▁the ▁Centre ▁of ▁South - E ast ▁Asian ▁Studies . ▁ ▁EL LE N , ▁Roy ▁( 1 9 9 3 ) ▁On ▁the ▁edge ▁of ▁the ▁Band a ▁zone : ▁past ▁and ▁present ▁in ▁the ▁social ▁organisation ▁of ▁a ▁Mol u cc