Eicher, D. L. (1968). Geologic time. Prentice-Hall.
芝加哥风格引文Eicher, Don L. Geologic Time. New Jersey: Prentice-Hall, 1968.
MLA引文Eicher, Don L. Geologic Time. Prentice-Hall, 1968.
警告：这些引文格式不一定是100％准确.
APA引文
Eicher, D. L. (1968). Geologic time. Prentice-Hall.
芝加哥风格引文Eicher, Don L. Geologic Time. New Jersey: Prentice-Hall, 1968.
MLA引文Eicher, Don L. Geologic Time. Prentice-Hall, 1968.