Two or More Works by the Same Author in the Same Year: If you have two sources by the same author in the same year, use lower-case letters (a, b, c) with the year to order the entries in the reference list. Use the lower-case letters with the year in the in-text citation.
The next type of board is the longboard or malibu (mal). The main difference in design is that the nose of the longboard is rounded. Other than that there is no real difference, though shortboards tend to have three fins and longboards tend to have a single fin.
Whiteboards come in many shapes, sizes and with different types of dry erase writing surfaces. There are porcelain steel, magnetic receptive whiteboards in either a standard high gloss or a low gloss finish for projection purposes, there is a HPL or high pressure laminate whiteboard, and there are also the economy Melamine whiteboards.