According to mla format, which of these works cited sources is a book? a. felluga, d. guide to literary and critical theory. purdue u, 28 nov. 2003. accessed 10 may 2006. b. navrud, st? e, and richard c. ready. valuing cultural heritage: applying valuation techniques to historic buildings, monuments, and artifacts. elgar press, 2002. c. leichenko, r. m. and coulson, n. e., listokin, d. (2001) historic preservation and residential property values: an analysis of texas cities. urban studies, 38: 1973-1987. d. wheaton, william. (1977) income and urban residence: an analysis of consumer demand for location. american economic review, 67: pp. 620-631.