APA

Rich R., . (1987). A CCD atlas of comparison spectra: thorium-argon hollow cathode. Kitt Peak: National Optical Astronomy Observatories.

Chicago

Rich R.M, . 1987. A CCD atlas of comparison spectra: thorium-argon hollow cathode. Kitt Peak: National Optical Astronomy Observatories.

Harvard

Rich R., . (1987). A CCD atlas of comparison spectra: thorium-argon hollow cathode. Kitt Peak: National Optical Astronomy Observatories.

MLA

Rich R.M, . A CCD atlas of comparison spectra: thorium-argon hollow cathode. Kitt Peak: National Optical Astronomy Observatories. 1987.