APA (7th ed.) Citation

Spanier, E. H. (1966). Obstruction theory. IMPA-CNPq.

Chicago Style (17th ed.) Citation

Spanier, E. H. Obstruction Theory. Río de Janeiro: IMPA-CNPq, 1966.

MLA (9th ed.) Citation

Spanier, E. H. Obstruction Theory. IMPA-CNPq, 1966.