Duncan, H. (1970). The Jehovah's witnesses and the second coming of Christ. [s.n].
Citazione stile Chigago Style (17a edizione)Duncan, Homer. The Jehovah's Witnesses and the Second Coming of Christ. [s.l.]: [s.n], 1970.
Citatione MLA (9a ed.)Duncan, Homer. The Jehovah's Witnesses and the Second Coming of Christ. [s.n], 1970.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.