APA

Richards S. H., Heathington K. & Fambro D. B. (1990). Evaluation of constant warning times using train predictors at a grade crossing with flashing light signals. : Transportation Research Record.

Chicago

Richards Stephen H, Heathington KW and Fambro Daniel B. 1990. Evaluation of constant warning times using train predictors at a grade crossing with flashing light signals. : Transportation Research Record.

Harvard

Richards S. H., Heathington K. and Fambro D. B. (1990). Evaluation of constant warning times using train predictors at a grade crossing with flashing light signals. : Transportation Research Record.

MLA

Richards Stephen H, Heathington KW and Fambro Daniel B. Evaluation of constant warning times using train predictors at a grade crossing with flashing light signals. : Transportation Research Record. 1990.