@Manual{tikzpgf2.10, title = {TikZ \& PGF, Manual for Version 2.10}, author = {Till Tantau}, year = 2007, url = {http://sourceforge.net/projects/pgf} } @book{texbook, author = "Donald E. Knuth", title = "The {TeX}book", publisher = "Addison-Wesley", year = 1996, } @Manual{tikzpgf3.0.0, title = {TikZ \& PGF, Manual for Version 3.0.0}, author = {Till Tantau}, year = 2013, url = {http://sourceforge.net/projects/pgf} }