Dennis B. Fradin. (1983). Astronomy (New True Book). Childrens Pr.
Cita Chicago (17th ed.)Dennis B. Fradin. Astronomy (New True Book). Childrens Pr, 1983.
Cita MLA (9th ed.)Dennis B. Fradin. Astronomy (New True Book). Childrens Pr, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.