Salvador, Amos (编). Chapter 8. Magnetostratigraphic polarity units. Stratigraphic Guide Second (abridged). International Commission on Stratigraphy. 1994. (原始内容存档于12 June 2020).
Salvador, Amos (编). Chapter 8. Magnetostratigraphic polarity units. Stratigraphic Guide Second (abridged). International Commission on Stratigraphy. 1994. (原始内容存档于12 June 2020).