from The Silver Surfer (Marvel, 1968 series) #13 (February 1970)
from Warlock (Marvel, 1972 series) #10 (December 1975)Part 1, Chapter 1: The Price
Chapter 2: Who is Thanos?
Chapter 3: Enter the Redemption Principle
Marv Wolfman was the Editor of the original story. Danny Fingeroth is the Reprint Editor.