Quorum requirements for a referendum to be valid

Constitución Política de la República de Nicaragua(Political Constitution of Nicaragua)

(Adopted in 1987, last amended in 2005)

http://www.wipo.int/wipolex/en/text.jsp?file_id=228189

Ley Electoral, Ley No. 331

(Enacted in January 2000)

http://pdba.georgetown.edu/Parties/Nica/Leyes/LeyElectoral.pdf