Plot of forces required by direction extrusion, indirect extrusion, and hydrostatic extrusion processes. Based on information from Drozda, Tom; Wick, Charles; Bakerjian, Ramon; Veilleux, Raymond F.; Petro, Louis (<span style="color: #777777;">(Please provide a date)</span>) <cite>Tool and manufacturing engineers handbook</cite><sup><a rel="nofollow" class="external autonumber" href="https://books.google.com/books?id=9ty5NPJ0UI4C">[1]</a></sup>, volume 2, SME, <small><a href="https://en.wikipedia.org/wiki/International_Standard_Serial_Number" class="extiw" title="w:International Standard Serial Number">ISBN</a> <a href="//commons.wikimedia.org/wiki/Special:BookSources/0872631354" title="Special:BookSources/0872631354">0872631354</a></small>.
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