International Grassland Congress Pennsylvania, & International Grassland Congress. (1952). Proccedings of the sixth international grassland congress. Pennsylvania: Pennsylvania State College.
Παραπομπή Chicago StyleInternational Grassland Congress Pennsylvania, και International Grassland Congress. Proccedings of the Sixth International Grassland Congress. Pennsylvania: Pennsylvania State College, 1952.
MLA引文International Grassland Congress Pennsylvania, και International Grassland Congress. Proccedings of the Sixth International Grassland Congress. Pennsylvania: Pennsylvania State College, 1952.
警告：這些引文格式不一定是100％准確.