4-810(1) Examples Window (restore)
Principle 1: Successive words abbreviated with a single capital letter are normally not separated from one another with a space «e.g.» .
Principle 2: Longer abbreviations are separated from one another and from single letter abbreviations with a space «e.g.».
Principle 3: In journal titles, successive single letters that refer to an entity are separated from other single letter abbreviations with a space «e.g.».
Principle 4: Numbers, including ordinal numbers (2d, 4th), are treated as single letters «e.g.».
4-820(1) Examples Window (restore)
Principle 1: In general abbreviations should end in a period «e.g.».
Principle 2: However, abbreviations that are contractions ending with an apostrophe and the last letter of the word should not be followed by a period «e.g.».
Principle 3: In addition, entities that are commonly referred to by their initials may be abbreviated using those initials without periods «e.g.».