Erdo?s, P., Hajnal, A., Rado, R., So?s, V. T., Hanjnal, A., Sos, V. T., . . . Erdos, P. (1975). Infinite and finite sets: To Paul Erdo?s on his 60th birthday. Amsterdam: North-Holland.

Erdo?s, Paul, A. Hajnal, Richard Rado, Vera T. So?s, A. Hanjnal, Vera T. Sos, R. Rado, and Paul Erdos. Infinite and Finite Sets: To Paul Erdo?s On His 60th Birthday. Amsterdam: North-Holland, 1975.

Erdo?s, Paul, et al. Infinite and Finite Sets: To Paul Erdo?s On His 60th Birthday. Amsterdam: North-Holland, 1975.