Werner, P., Worrall, D., & Birkinshaw, M. (2002). NGC 6251 at multiple scales and wavelengths.
芝加哥风格引文Werner, P., D. Worrall, 与 M. Birkinshaw. NGC 6251 at Multiple Scales and Wavelengths. 2002.
MLA引文Werner, P., et al. NGC 6251 at Multiple Scales and Wavelengths. 2002.
警告：这些引文格式不一定是100％准确.