1.1 We prefer US English spelling conventions.
organize, utilize, color, center, jail, draft, airplane, jewelry
We do accept UK English spelling that occasionally occurs in US English, but expect consistent spelling within a manuscript. Consult the online Merriam-Webster Dictionary in case of doubt.
towards, amidst, whilst
1.2 The possessive form of names ending in -s, -z, -us, or -es use ’s as normal, except for Greek or Hellenized words ending in -es.
Cyclops’s, Jesus’s, Alvarez’s, Tacitus’s, Jones’s