Wood, D., & Wood, A. (1996). Piggies. Harcourt.
Lua i Stíl Chicago (17ú heag.)Wood, Don, agus Audrey Wood. Piggies. San Diego, CA: Harcourt, 1996.
Lua MLA (8ú heag.)Wood, Don, agus Audrey Wood. Piggies. Harcourt, 1996.
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