APA-viite (7. p.)
WERCH, C., & ET AL. (1994). STAGES OF DRUG USE ACQUISITION AMONG COLLEGE STUDENTS: IMPLICATIONS FOR THE PREVENTION OF DRUG ABUSE.
Chicago-viite (17. p.)
WERCH, C.E, ja ET AL. STAGES OF DRUG USE ACQUISITION AMONG COLLEGE STUDENTS: IMPLICATIONS FOR THE PREVENTION OF DRUG ABUSE. 1994.
MLA-viite (9. p.)
WERCH, C.E, ja ET AL. STAGES OF DRUG USE ACQUISITION AMONG COLLEGE STUDENTS: IMPLICATIONS FOR THE PREVENTION OF DRUG ABUSE. 1994.
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