Christian, J. L. (1976). Extra-terrestial intelligence: The first encounter. Prometheus Books.
Chicagoスタイル(17版)引用形式Christian, J. L. Extra-terrestial Intelligence: The First Encounter. Buffalo, NY 14215: Prometheus Books, 1976.
MLA(9版)引用形式Christian, J. L. Extra-terrestial Intelligence: The First Encounter. Prometheus Books, 1976.
警告: この引用は必ずしも正確ではありません.