APA
Hajek J. J., . (1977). Optimal sample size of roadside - interview origin destination surveys. Canada: Ministry of transportation and communication.
Chicago
Hajek J J, . 1977. Optimal sample size of roadside - interview origin destination surveys. Canada: Ministry of transportation and communication.
Harvard
Hajek J. J., . (1977). Optimal sample size of roadside - interview origin destination surveys. Canada: Ministry of transportation and communication.
MLA
Hajek J J, . Optimal sample size of roadside - interview origin destination surveys. Canada: Ministry of transportation and communication. 1977.