The Importance of External Validity. Steckler, A. & McLeroy, K. R. American Journal of Public Health, 98(1):9–10, January, 2008.
The Importance of External Validity [link]Paper  doi  bibtex   
@article{steckler_importance_2008,
	title = {The {Importance} of {External} {Validity}},
	volume = {98},
	issn = {0090-0036},
	url = {https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2156062/},
	doi = {10.2105/AJPH.2007.126847},
	number = {1},
	urldate = {2020-02-18},
	journal = {American Journal of Public Health},
	author = {Steckler, Allan and McLeroy, Kenneth R.},
	month = jan,
	year = {2008},
	pmid = {18048772},
	pmcid = {PMC2156062},
	pages = {9--10},
}

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