You will need more citations to prove that point. Same publication, more recently published, "Two Types of Diversity Training That Really Work".

"For one, a recent meta-analysis of over 40 years of diversity training evaluations showed that diversity training can work, especially when it targets awareness and skill development and occurs over a significant period of time."

https://hbr.org/2017/07/two-types-of-diversity-training-that...