Cita APA (7a ed.)

Bohr, N., & Nielsen, J. R. (1977). The periodic system (1920-1923). North-Holland Pub. Co..

Cita Chicago Style (17a ed.)

Bohr, Niels, y J. Rud Nielsen. The Periodic System (1920-1923). Amsterdam: North-Holland Pub. Co., 1977.

Cita MLA (8a ed.)

Bohr, Niels, y J. Rud Nielsen. The Periodic System (1920-1923). North-Holland Pub. Co., 1977.