References to The Mencius are given in the form "2A6.3", which is the form used by Van Norden. Unfortunately, almost every translator has chosen to use a different form. The original work, see ctext.org, assigns each chapter a name, dividing them into two parts. Legge uses Roman numerals, thus 2A6.3 is Book II, part I, chapter VI, verse 3. Some translators have abandoned the two part numbering in favour of conventional Western chapter numbering, thus 2A is chapter three. I have stuck with Van Norden's numbering because it's the easiest; which ever system one uses, cross-checking different versions of the text can be something of a nightmare.