Retana, Maria Luisa The pig that is not a pig / Maria Luisa Retana / il. Marian Weaver / tr. Guillermo Retana - Tucson, Arizona : High Desert Productions , 1999 , c1996. - wp. pb il. us ; 7 Bilingual in english and spanish ISBN: 0-9652920-8-8 Dewey Class. No.: INF CUE RET