"message the call is heard: “Come out of her, My people.” These announcements, uniting with the third angel's message, constitute the final warning to be given to the inhabitants of the earth. GC 604.1"
"And I heard another voice from heaven, saying, Come out of her, my people, that ye be not partakers of her sins, and that ye receive not of her plagues."
The EGW passage directly quotes Revelation 18:4.
"Fearful is the issue to which the world is to be brought. The powers of earth, uniting to war against the commandments of God, will decree that “all, both small and great, rich and poor, free and bond” ( Revelation 13:16 ), shall conform to the customs of the church by the observance of the false sabbath. All who refuse compliance will be visited with civil penalties, and it will finally be declared that they are deserving of death. On the other hand, the law of God enjoining the Creator's rest day demands obedience and threatens wrath against all who transgress its precepts. GC 604.2"
"And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads:"
Ellen White directly references Revelation 13:16 in this passage.
"With the issue thus clearly brought before him, whoever shall trample upon God's law to obey a human enactment receives the mark of the beast; he accepts the sign of allegiance to the power which he chooses to obey instead of God. The warning from heaven is: “If any man worship the beast and his image, and receive his mark in his forehead, or in his hand, the same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of His indignation.” Revelation 14:9, 10 . GC 604.3"
"And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand,"
EGW directly quotes Revelation 14:9 in her explanation of the mark of the beast.