 ያልሆኑ-የሙከራ ውሂብ በሲጋራና ግምቶች በማድረግ ላይ ግሩም መጽሐፍ ርዝመት ሕክምና ለማግኘት ይህንን ይመልከቱ Rosenbaum (2002), Rosenbaum (2009), Shadish, Cook, and Campbell (2001), እና Dunning (2012).
Pakuti chabwino mankhwala Buku kutalika kupanga ziwerengero causal pazimene sanali experimental kuona Rosenbaum (2002), Rosenbaum (2009), Shadish, Cook, and Campbell (2001), ndipo Dunning (2012).