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Books about Lovrak:
Josip Pavicic, Antun R. Boglic, Mato Lovrak: Izabrana Djela. (=Pet Stoljeca Hrvatske Knjizevnosti; Vol. 98). by Vlatko (Ed.) Pavletic (1971)
Wiki information Lovrak:
Mato Lovrak was a Croatian writer for children.
Družba Pere Kvržice is a Croatian Children's film directed by Vladimir Tadej. It was released in 1970. It is based on the children's novel of the same name by Mato Lovrak.