GWYNNE PETER/ JEFFRIES, B. (1998). SPACE AND PLANETS.
Cita Chicago (17th ed.)GWYNNE PETER/ JEFFRIES, BRIAN. SPACE AND PLANETS. 1998.
Cita MLA (9th ed.)GWYNNE PETER/ JEFFRIES, BRIAN. SPACE AND PLANETS. 1998.
Atenció: Aquestes cites poden no estar 100% correctes.