Cita APA (7th ed.)
Wesselius, P. R. (1972). Neutral Hydrogen in the solar neighbourhood.
Cita Chicago (17th ed.)
Wesselius, Paul Ronald. Neutral Hydrogen in the Solar Neighbourhood. Groningen, 1972.
Cita MLA (9th ed.)
Wesselius, Paul Ronald. Neutral Hydrogen in the Solar Neighbourhood. 1972.
Atenció: Aquestes cites poden no estar 100% correctes.