but seems like too mant reformed quote from and use scriptures more so than the bible itself
For myself, it is easier. Especially when providing scriptural verses, if the person won't reference the Scriptures or consider what is said why take any more time?
For example, the WCF was painstakingly articulated, sometimes a single sentence took months to compile. The sentence was considered and debated before being written. Reformed right in the first chapter of the WCF believe as what is stated on the topic of Sola Scriptura:
IV. The authority of the holy Scripture, for which it ought to be believed and obeyed, dependeth not upon the testimony of any man or church, but wholly upon God (who is truth itself), the Author thereof; and therefore it is to be received, because it is the Word of God.a
a. 1 Thes 2:13; 2 Tim 3:16; 2 Pet 1:19, 21; 1 John 5:9.
X. The Supreme Judge, by which all controversies of religion are to be determined, and all decrees of councils, opinions of ancient writers, doctrines of men, and private spirits, are to be examined, and in whose sentence we are to rest, can be no other but the Holy Spirit speaking in the Scripture.
a
a. Mat 22:29, 31; Eph 2:20 with Acts 28:25.
The Westminster Confession of Faith (1646-1647) with Scripture Proofs
thewestminsterstandard.org