Sources

1. "Sexism in Single-Sex and Coeducational Independent Secondary School Classrooms" by Lee, Marks, and Byrd

2. "Achievement, Gender and the Single-Sex/Coed Debate" by Harker

3. http://books.google.com/books?hl=en&lr=&id=sEGmrbnvxU4C&oi=fnd&pg=PR7&dq=single-sex+schools+history&ots=YEYpm6vi6O&sig=8wJ23GIfAM8jIkRjIyV2mwCrpuE#v=onepage&q=single-sex%20schools%20history&f=false  by Salomone

4. http://books.google.com/books?hl=en&lr=&id=Xfa1AQAAQBAJ&oi=fnd&pg=PA31&dq=campbell+and+sanders+single-sex+education&ots=ld9QRHgWhn&sig=VJg5NTclzFklGqjydE7OKfmjo9M#v=onepage&q=campbell%20and%20sanders%20single-sex%20education&f=false   by Riordan/ Campbell and Sanders

5. http://www.umich.edu/~psycours/797/mael.pdf by Mael

6.http://www.jstor.org/stable/1163247  by LePore and Warren

here we go!