The Question and Answer section for The Love Song of J. Alfred Prufrock is a great resource to ask questions, find answers, and discuss the novel.
Do you mean by Carl Sandburg? What specific poem are you referring to?
A few of the allusions in The Love Song of J. Alfred Prufrock are as follows;
Line 10: The Pioneers, ".... o lead you to an overwhelming question …"
Michaelangelo, Lines 13 and 14
Hesiod, "And time for all the works and days of hands..."
From the text,
Let us go then, you and I,
When the evening is spread out against the sky