TYRRELL, G. (1967). Principles of petrology : an introduction: To the science of rocks. Methuen.
Chicago-viite (17. p.)TYRRELL, G.W. Principles of Petrology : An Introduction: To the Science of Rocks. London: Methuen, 1967.
MLA-viite (9. p.)TYRRELL, G.W. Principles of Petrology : An Introduction: To the Science of Rocks. Methuen, 1967.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.