Tirado, H. R. (2002). Diagnostic diagrams of electron density versus excitation for planetary nebulae. Universidad Nacional Autónoma de México.
Citazione stile Chigago Style (17a edizione)Tirado, H. Riesgo. Diagnostic Diagrams of Electron Density Versus Excitation for Planetary Nebulae. Universidad Nacional Autónoma de México, 2002.
Citatione MLA (9a ed.)Tirado, H. Riesgo. Diagnostic Diagrams of Electron Density Versus Excitation for Planetary Nebulae. Universidad Nacional Autónoma de México, 2002.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.