References? The Gates foundation strove to keep its nose clean from abortion. Bill Gates did not want Microsoft to be hurt by this inflammatory issue.
Contraceptives were a different story.
"The young Rockefeller also developed his own interests. Through his work as a member of the board of directors of the Bureau of Social Hygiene (to which he was appointed in 1928), Rockefeller began a lifelong commitment to the issues of population control and birth control. In 1932, he became chairman of the Delinquency Committee of the Boys Bureau of New York City. Six years later the Committee published its recommendations for handling youthful offenders in Youth in the Toils.
While the Bill & Melinda Gates Foundation claims not to fund abortion, they do fund population control (though they call it "family planning"):