It's published by Shueisha, like Daizenshuu and Super Exciting guide and the orginal language of that guide is Japanese, but was translated to Spanish, for them.
"Original text and design was created in Japan by SHUEISHA inc, Tokyo"
"El texto original y los diseños fueron creados en Japón por SHUEISHA inc, Tokyo"
That guide has some interviews with Akira Toriyama.
Akira Toriyama talking about saiyans hair.
Akira Toriiyama talking about Super Saiyans.
Akira Toriyama talking about androids 17 and 18. And what happened with Pilaf,Shu and Mai.
Cars are the passion of Akira Toriyama, stated by himself. And even he made QVOLT.
He likes the animals.
Akira Toriyama makes models in his studio (photos of his workshop)
Akira Toriyama, and his work tools (Photos).
Akira Toriyama himself explains how to draw Goku and Vegeta.
Akira Toriyama, and his beloved penholder.
Akira Toriyama, re-teach how to draw Goku (Advanced)
His preferred references material (photos)
Akira Toriyama and his favorite computers (photos)
Akira Toriyama and his favorite graphic tablets photos)
Akira Toriyama talks about coloring before the digital age
Akira Toriyama talks about Son Goku.
And thats not all interviews.