Sources?

What are the sources about Agnes Brock? I just found a source (http://books.google.com/books?id=zPnD0kvrLf8C&lpg=PA397&dq=...) saying John & Agnes Wiseman married about 1521, and since Agnes Brock was born a decade earlier, it seems unlikely she was their daughter. It also lists their 10 children, none of them being named Agnes. On top of that, Agnes Wiseman (Josselyn) would've been about 11 years old at the time of giving birth, making it seem even less likely.