L. Barnes-Svarney Patricia, & R. Porcellino Michael. (1999). Through the telescope: A Guide for the Amateur Astronomer, Revised Edition (Tái bản lần thứ 2.). American: Mcgraw Hill.
Παραπομπή Chicago StyleL. Barnes-Svarney Patricia, και R. Porcellino Michael. Through the Telescope: A Guide for the Amateur Astronomer, Revised Edition. Tái bản lần thứ 2. American: Mcgraw Hill, 1999.
Παραπομπή MLAL. Barnes-Svarney Patricia, και R. Porcellino Michael. Through the Telescope: A Guide for the Amateur Astronomer, Revised Edition. Tái bản lần thứ 2. American: Mcgraw Hill, 1999.
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