four. Sources. Should really the Customer demand certain source materials to generally be utilized while in the Buy procedure, she/he have to specify Those people sources and/or provide them to the Writer.对于当代大å¦ç”Ÿæ¥è¯´ï¼Œâ€œä»£è¯¾â€ã€â€œè®ºæ–‡ä»£å†™â€æ—©�