The Lotus Sutra is required but is listed as optional in case you would prefer not to buy the book. The same text is available free as a pdf at http://www.numatacenter.com/digital/dBET_T0262_LotusSutra_2007.pdf.
Buddhist scriptures, Author: ed. by Donald S. Lopez., Publisher: Penguin [New ed.] 2004
The Bodhicary?vat?ra, Author: S?ntideva ; translated with introduction and notes by Kate Crosby and Andrew Skilton ; with a general introduction by Paul Williams., Publisher: Oxford University Press 2008
The Lotus Sutra, Author: translated from the Chinese of Kum?raj?va (Taish?, Volume 9, Number 262) by Tsugunari Kubo and Akira Yuyama., Publisher: Numata Center for Buddhist Translation and Research Rev. 2nd e 2007