Polskie Towarzystwo Miłośników Astronomii. (1956). Annual Scientific Supplement to Urania: The popular astronomical magazine published by the Polish Amateur Astronomical Society. PAAS.
Cita Chicago Style (17a ed.)Polskie Towarzystwo Miłośników Astronomii. Annual Scientific Supplement to Urania: The Popular Astronomical Magazine Published by the Polish Amateur Astronomical Society. Cracow: PAAS, 1956.
Cita MLA (9a ed.)Polskie Towarzystwo Miłośników Astronomii. Annual Scientific Supplement to Urania: The Popular Astronomical Magazine Published by the Polish Amateur Astronomical Society. PAAS, 1956.
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