Pode ter sido o Zombie Survival Guide do Max Brooks. Da seção sobre Armas e técnicas de combate :
Finally, at five meters, we used the last bit of fuel in the flamethrower! The sons of bitches lit up like torches but just wouldn’t stop! One of them grabbed [Name Withheld], setting him on fire as it bit through his neck. I saw the rest of those things surround him as we took off for the jungle, a mob of burning bodies squatting down to tear another screaming human torch apart.
Além disso, na seção Fogo :
Flesh — human, undead, or otherwise — takes a long time to burn. In the minutes or hours before a blazing zombie succumbs, it will become a walking — or to be perfectly accurate, a shambling — torch. Several cases have been recorded in which burning ghouls have done more damage, even caused more deaths, than they would have with only their fingernails and teeth.
Por fim (e eu não tenho acesso ao livro, então não posso verificar onde ele apareceu), TV Tropes menciona em Retaliação Infernal como também está em Zombie Survival Guide :
"Established wisdom for modern zombie hunters: The only thing worse than a horde of zombies is a horde of flaming zombies."
Eles também notam que a menção do perigo de zumbis em chamas surge em World War Z também.