 ለምሳሌ ያህል, Correll, Benard, and Paik (2007) አንድ ቤተ ሙከራ ሙከራ እና ምንጭ "እናትነት መቀጫ.
For example, Correll, Benard, and Paik (2007) used both a lab experiment and a field experiment in an attempt to find the sources of the "motherhood penalty."