Apex domains cannot have CNAME records.
Question and response
Question
dig globalsources.com. NS
Answer
globalsources.com. 4 NS usawsns.globalsources.com.
globalsources.com. 4 NS ns.globalsources.com.
globalsources.com. 4 NS frawsns.globalsources.com.
globalsources.com. 4 NS nscn1.globalsources.com.
globalsources.com. 4 NS hkawsns.globalsources.com.
Authority
The response has no authority records.
Additional
ns.globalsources.com. 4 A 203.92.211.200
nscn1.globalsources.com. 4 A 54.223.156.19
frawsns.globalsources.com. 4 A 3.69.140.13
hkawsns.globalsources.com. 4 A 18.167.86.3
usawsns.globalsources.com. 4 A 52.42.135.176
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0