Dyfyniad APA

Chacón Serrano, W. (2017). GEOGRAPHICAL DISTRIBUTION OF PREVALENCE LEVELS DRUG USE IN POPULATION OF HIGH SCHOOL EDUCATION IN COSTA RICA, 2015.

Dyfyniad Arddull Chicago

Chacón Serrano, William. GEOGRAPHICAL DISTRIBUTION OF PREVALENCE LEVELS DRUG USE IN POPULATION OF HIGH SCHOOL EDUCATION IN COSTA RICA, 2015. 2017.

Dyfyniad MLA

Chacón Serrano, William. GEOGRAPHICAL DISTRIBUTION OF PREVALENCE LEVELS DRUG USE IN POPULATION OF HIGH SCHOOL EDUCATION IN COSTA RICA, 2015. 2017.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.