Sections 317 of the Communications Act (and all amendments):
US CODE TITLE 47 - TELEGRAPHS, TELEPHONES, AND RADIOTELEGRAPHS; CHAPTER 5 - WIRE OR RADIO COMMUNICATION; SUBCHAPTER III - SPECIAL PROVISIONS RELATING TO RADIO
47 USC 317: Announcement of payment for broadcast
Sections 508 of the Communications Act (and all amendments):
US CODE TITLE 47 - TELEGRAPHS, TELEPHONES, AND RADIOTELEGRAPHS; CHAPTER 5 - WIRE OR RADIO COMMUNICATION; SUBCHAPTER V - PENAL PROVISIONS; FORFEITURES
47 USC 508: Disclosure of payments to individuals connected with broadcasts
Section 73.1212 of the FCC Rules and Regulations (and all amendments):
73.1212 Sponsorship identification; list retention; related requirements