Lua APA (7ú heag.)

Krug, R. (1998). Usmle step 1 Review Series: Behavioral Sciences U S Health Care Biostatistics & Epidemiology. s.n.

Lua i Stíl Chicago (17ú heag.)

Krug, Ronald. Usmle Step 1 Review Series: Behavioral Sciences U S Health Care Biostatistics & Epidemiology. Chicago: s.n, 1998.

Lua MLA (9ú heag.)

Krug, Ronald. Usmle Step 1 Review Series: Behavioral Sciences U S Health Care Biostatistics & Epidemiology. s.n, 1998.

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