Feldt, R., Johnson, L., & Neumann, M. (2002). Ruby developer's guide. Syngress Pub..
Chicagoスタイル(17版)引用形式Feldt, Robert, Lyle Johnson, , Michael Neumann. Ruby Developer's Guide. Rockland, MA: Syngress Pub., 2002.
MLA(9版)引用形式Feldt, Robert, et al. Ruby Developer's Guide. Syngress Pub., 2002.
警告: この引用は必ずしも正確ではありません.