English Teaching Division. (1971). Carl Sandburg: His life, his poems, his land. United States Information Agency.
Citazione stile Chigago Style (17a edizione)English Teaching Division. Carl Sandburg: His Life, His Poems, His Land. Washington, D.C: United States Information Agency, 1971.
Citatione MLA (9a ed.)English Teaching Division. Carl Sandburg: His Life, His Poems, His Land. United States Information Agency, 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.