APA Citation

Kopal, Z. Widening Horizons. Taplinger Publishing Company, New York, 1970.

Chicago Style Citation

Kopal, Zdenek. Widening Horizons. Taplinger Publishing Company, New York, 1970.

MLA Citation

Kopal, Zdenek. Widening Horizons. Taplinger Publishing Company, New York, 1970.

Warning: These citations may not always be 100% accurate.