International Grassland Congress Pennsylvania, & International Grassland Congress. (1952). Proccedings of the sixth international grassland congress. Pennsylvania: Pennsylvania State College.
শিকাগো স্টাইলে সাইটেশনInternational Grassland Congress Pennsylvania, এবং International Grassland Congress. Proccedings of the Sixth International Grassland Congress. Pennsylvania: Pennsylvania State College, 1952.
এমএলএ সাইটেশনInternational Grassland Congress Pennsylvania, এবং International Grassland Congress. Proccedings of the Sixth International Grassland Congress. Pennsylvania: Pennsylvania State College, 1952.
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