APA (7 वां संस्करण) प्रशस्ति पत्र
BIJNEN, F., & ET AL. (1998). AGE, PERIOD, AND COHORT EFFECTS ON PHYSICAL ACTIVITY AMONG ELDERLY DURING 10 YEARS OF FOLLOW-UP: THE ZUTPHEN ELDERLY STUDY.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
BIJNEN, F.C.H, और ET AL. AGE, PERIOD, AND COHORT EFFECTS ON PHYSICAL ACTIVITY AMONG ELDERLY DURING 10 YEARS OF FOLLOW-UP: THE ZUTPHEN ELDERLY STUDY. 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
BIJNEN, F.C.H, और ET AL. AGE, PERIOD, AND COHORT EFFECTS ON PHYSICAL ACTIVITY AMONG ELDERLY DURING 10 YEARS OF FOLLOW-UP: THE ZUTPHEN ELDERLY STUDY. 1998.
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