2015 January 4, Bobbi S. Low,Why Sex Matters: A Darwinian Look at Human Behavior - Revised Edition, Princeton University Press,→ISBN, page63:
Four kinds of first-cousin marriages are possible. A man could marry (1) his father's brother's daughter (FBD), (2) his mother's brother's daughter (MBD), (3) his father's sister's daughter (FZD), or (4) his mother's sister's daughter[…]