Παραπομπή APA

Buchi, J. R., & Siefkes, D. (1973). Monadic second order theory of all countable ordinals.

Παραπομπή Chicago Style

Buchi, J Richard, και Dirk Siefkes. Monadic Second Order Theory of All Countable Ordinals. Springer-Verlag, Berlin, 1973.

Παραπομπή MLA

Buchi, J Richard, και Dirk Siefkes. Monadic Second Order Theory of All Countable Ordinals. 1973.