Which citation errors need to be corrected? Select two options. The name of the source needs to be listed only once.
A comma should replace the period, and the period should follow the citation.
The page number should precede the author’s name.
Quotation marks should replace the parentheses that surround the citation.
The period should be placed after the parenthetical citation

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.