6 GCA § 6103: When Agreements Must be in Writing.

In the following the agreement is invalid, unless the same or some note or memorandum thereof be in writing, and subscribed by the party charged, or by his agent. Evidence, therefore, of the agreement, cannot be received without the writing or secondary evidence of its contents:

1. An agreement that by its terms is not to be performed within a year of the making thereof;

2. A special promise to answer for the debt, default or miscarriage of another, except in the cases provided for in 18 GCA § 31202;

3. An agreement made upon consideration of marriage other than a mutual promise to marry;

4. An agreement for the leasing for a longer period than one (1) year, or for the sale of real property, or of an interest therein; and such agreement, if made by an agent of the party sought to be charged, is invalid, unless the authority of the agent is in writing, subscribed by the party sought to be charged;

5. An agreement authorizing or employing an agent or broker to purchase or sell real estate for compensation or a commission;

6. An agreement which by its terms is not to be performed during the lifetime of the promisor, or an agreement to devise or bequeath any property, or to make any provision for any person by will;

7. An agreement, promise, contract or warranty of cure relating to medical treatment or the results of a service to be rendered by a person licensed by the territory of Guam to practice a healing art.