The written deed, including the unilateral promise of sale accepted and the preliminary contract provided for in the article L. 261-15 du code de la construction et de l’habitation, the purpose of which is to record one of the transactions referred to in 1° of article L. 313-1, must indicate whether the price will be paid directly or indirectly, even in part, with or without the help of one or more loans governed by sections 1 to 5 of this chapter.