"978-0-13-198924-5"@en. . . . . "Source: Freebase - The World's database". _:ShJUqZAu1730. _:ShJUqZAu1731. . . . "Digital Design, 4th Edition"@en. "2006-12-15". _:ShJUqZAu1730 "digital_design_4th_edition". _:ShJUqZAu1730 . _:ShJUqZAu1731 "best". _:ShJUqZAu1731 .