What was the experiment with the male and female toddler, and were is a spurce for it?

I always hear about that experiment, were and obstacle was plased between a female and male toddler and their moms.

The male toddler tried climbing or pushing the obstacle, while the female toddler started crying.

Can anyone give me a link or source for that, since all Google shows me are cruel experiments on children from the 1950‘s.