A Montana general bill of sale is a type of receipt that details the purchase and sale of personal property sold by an individual or entity to a buyer. This generic form contains blank fields where the buyer and seller can enter their names, addresses and contact information. They will then write a description of the property sold and the final sale price. To authenticate the bill of sale, the parties must include their signatures on the second page of the document. If the parties wish to add an extra layer of validation, they may sign the form in the presence of witnesses or a notary public.