(2001). Maling paggamit ng backpack, maaring maging sanhi ng chronic back pain. Kabayan.
Chicago Style (17. basım) Atıf"Maling Paggamit Ng Backpack, Maaring Maging Sanhi Ng Chronic Back Pain." Kabayan 2001.
MLA (9th ed.) Atıf"Maling Paggamit Ng Backpack, Maaring Maging Sanhi Ng Chronic Back Pain." Kabayan, 2001.
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