This section is from the book "The Law Of Contracts", by William Herbert Page. Also available from Amazon: Commercial Contracts: A Practical Guide to Deals, Contracts, Agreements and Promises.
Sec. 49. Definition of contract.
Sec. 50. Parol contracts.
Sec. 51. Unilateral contracts.
Sec. 53. Place of executed contract in law.
Sec. 54. Classes of contract as to validity.
Sec. 55. Nomenclature of the law.