APA Format
Elwood, J. Mark . (). Critical... : Critical appraisal of a retrospective cohort study. ( Ket. Lihat halaman 433-452 ) ( Bab. 13 ) . : Oxford: Oxford University Press, 2007
MLA Format
Elwood, J. Mark . Critical... : Critical appraisal of a retrospective cohort study. ( Ket. Lihat halaman 433-452 ) ( Bab. 13 ) . : Oxford: Oxford University Press, 2007,
Australian/Harvard Format
Elwood, J. Mark . . Critical... : Critical appraisal of a retrospective cohort study. ( Ket. Lihat halaman 433-452 ) ( Bab. 13 ) . Oxford: Oxford University Press, 2007, 
Warning: These citations may not always be 100% accurate.