By Puerto, Carlos. Madrid :Gaviota 2008 . 176 p. , Precede al tit.: Tercer enigma ;19cm. 9788439280910
By Puerto, Carlos. León :Gaviota 2004 . 164 p. , Indice ;19cm. 8439280904
By Puerto, Carlos. Madrid :Gaviota 2002 . 164 p , Infantil: 8-12 anos ;19cm. 8439280920
By Teixidor, Emili (. Madrid :sm 2012 . 82 p. , DE 6 A 8 ANOS ;19cm. 9788467556506