Johnson, M. R. (2011). Hard to reach: Easy to omit. Prim Care Respir J.
シカゴスタイル引用形Johnson, Mark RD. "Hard to Reach: Easy to Omit." Prim Care Respir J 2011.
MLA引用形式Johnson, Mark RD. "Hard to Reach: Easy to Omit." Prim Care Respir J 2011.
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