Introduction.

MLA

Little, Roderick J. A., and Donald B. Rubin. “Introduction.” Statistical Analysis with Missing Data, Jan. 2002, pp. 1–23. EBSCOhost, https://doi.org/10.1002/9781119013563.ch1.

APA

Little, R. J. A., & Rubin, D. B. (2002). Introduction. Statistical Analysis with Missing Data, 1–23. https://doi.org/10.1002/9781119013563.ch1

Chicago

Little, Roderick J. A., and Donald B. Rubin. 2002. “Introduction.” Statistical Analysis with Missing Data, January, 1–23. doi:10.1002/9781119013563.ch1.