 ለምሳሌ ያህል Correll, Benard, and Paik (2007) "የእናትነት ቅጣት" ምንጮችን ለማግኘት ሙከራና የሙከራ ሙከራን ሁሉ ተጠቅመዋል.
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."