To show possession with singular nouns (common or proper) and proper names, add an apostrophe followed by s:
a dog’s bone [the bone belonging to the dog] the truck’s headlights Dr Smith’s car Lady Mary’s smile
Do the same to show attribution:
Australia’s population [the population of Australia] Earth’s circumference Japan’s politics
Sydney’s traffic Plato’s philosophy the Royal Commission’s recommendations
And follow the same rule for singular nouns that already end in s:
the boss’s job description the glass’s shape James’s car Tacitus’s Histories Jesus’s teachings
