Bethea, D. C. (1973). Introductory maternity nursing. Lippincott.
Lua i Stíl Chicago (17ú heag.)Bethea, Doris C. Introductory Maternity Nursing. Philadelphia: Lippincott, 1973.
Lua MLA (9ú heag.)Bethea, Doris C. Introductory Maternity Nursing. Lippincott, 1973.
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