https://acikders.ankara.edu.tr/pluginfile.php/128641/mod_page/content/1/D%C3%BCnya%20ve%20T%C3%BCrkiyede%20Et%20ve%20S%C3%BCt%20%C3%9Cretiminde%20S%C4%B1%C4%9F%C4%B1r%C4%B1n%20Yeri.pdf