Cita APA (7th ed.)
HARTOG, H. W. d. (1969). Color Centers in alkaline earth fluorides.
Cita Chicago (17th ed.)
HARTOG, Hendrik Willem den. Color Centers in Alkaline Earth Fluorides. Groningen, 1969.
Cita MLA (9th ed.)
HARTOG, Hendrik Willem den. Color Centers in Alkaline Earth Fluorides. 1969.
Atenció: Aquestes cites poden no estar 100% correctes.