Soybeans contact form?

I am studing certain matters in connection to contractual formalities referencing the physical marketing of agricultural commodities internationally, mainly soybeans and other grains. Could anyone provide me with an indication on where to obtain sound drafts of international trade agreement involving the export of agricultural commodities basis ES-WORKS, FOB, CIF and CFR, including the texts of its related annexes covering the methods usually practiced for the purchase of the goods, as well with any of the texts connected to the performance guarantees covering the delivery of the physical commodity? I have been reviewing all sorts of futures contracts over the internet, particularly, those of a number of international exchanges (CBOT and the like) but could not find any draft of lawful trading agreement in line which contained deep data on the operational methods in relation to the actual physical delivery proactices and mechanisms to the business? Cheers. Kisu