APA (7e ed.) Bronvermelding
VETTER, N., & FORD, D. (1990). SMOKING PREVENTION AMONG PEOPLE AGED 60 AND OVER: A RANDOMIZED CONTROLLED TRIAL.
Chicago (17e ed.) Bronvermelding
VETTER, N.J, en D. FORD. SMOKING PREVENTION AMONG PEOPLE AGED 60 AND OVER: A RANDOMIZED CONTROLLED TRIAL. 1990.
MLA (9e ed.) Bronvermelding
VETTER, N.J, en D. FORD. SMOKING PREVENTION AMONG PEOPLE AGED 60 AND OVER: A RANDOMIZED CONTROLLED TRIAL. 1990.
Let op: Deze citaties zijn niet altijd 100% accuraat.