Refining the test phase of usability evaluation: How many subjects is enough?. Virzi, R. A Human factors, 34(4):457–468, 1992.
bibtex   
@article{virzi_refining_1992,
	Author = {Virzi, Robert A},
	Issn = {0018-7208},
	Journal = {Human factors},
	Number = {4},
	Pages = {457--468},
	Title = {Refining the test phase of usability evaluation: {How} many subjects is enough?},
	Volume = {34},
	Year = {1992}}

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