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de Land PN, Chase WW. Statistics notebook: entry II.B: Observational study, (1) retrospective study, and (2) prospective study. Optom Vis Sci. 1991;68(2):159-61doi: 10.1097/00006324-199102000-00012.
de Land, P. N., & Chase, W. W. (1991). Statistics notebook: entry II.B: Observational study, (1) retrospective study, and (2) prospective study. Optometry and vision science : official publication of the American Academy of Optometry, 68(2), 159-61. https://doi.org/10.1097/00006324-199102000-00012
de Land, P N, and Chase, W W. "Statistics notebook: entry II.B: Observational study, (1) retrospective study, and (2) prospective study." Optometry and vision science : official publication of the American Academy of Optometry vol. 68,2 (1991): 159-61. doi: https://doi.org/10.1097/00006324-199102000-00012
de Land PN, Chase WW. Statistics notebook: entry II.B: Observational study, (1) retrospective study, and (2) prospective study. Optom Vis Sci. 1991 Feb;68(2):159-61. doi: 10.1097/00006324-199102000-00012. PMID: 2027656.
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