OPEN UNIVERSITY. S25-COURSE TEAM. ORBITALS.
芝加哥风格引文OPEN UNIVERSITY. S25-COURSE TEAM. ORBITALS. 2ND ED. BLETCHLEY, OPEN UNIV. PR., 1973. 55, 56P.
MLA引文OPEN UNIVERSITY. S25-COURSE TEAM. ORBITALS.
警告：这些引文格式不一定是100％准确.
APA引文
OPEN UNIVERSITY. S25-COURSE TEAM. ORBITALS.
芝加哥风格引文OPEN UNIVERSITY. S25-COURSE TEAM. ORBITALS. 2ND ED. BLETCHLEY, OPEN UNIV. PR., 1973. 55, 56P.
MLA引文OPEN UNIVERSITY. S25-COURSE TEAM. ORBITALS.