The notion of ethological ‘need’, models of motivation and animal welfare. Hughes, B. & Duncan, I. Anim. Behav, 36:1696–1707, 1988.
bibtex   
@article{hughes_notion_1988,
	title = {The notion of ethological ‘need’, models of motivation and animal welfare},
	volume = {36},
	language = {en},
	journal = {Anim. Behav},
	author = {Hughes, B. and Duncan, I.},
	year = {1988},
	pages = {1696--1707},
}

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