Historical Rules · 10 August 2018
Rule 208.3
Official source text from the 10 August 2018 Rules release
A noncreature permanent has no power or toughness, even if it’s a card with a power and toughness printed on it (such as a Vehicle). A noncreature object not on the battlefield has power or toughness only if it has a power and toughness printed on it.