Bibliografi : hlm. 251-255 No Inv.: 141118/Psm/Perp/14/1c
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Jilid 2; Judul asli : Child Development ; No. Inv. :147627/P/Perp/15/1c
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No Inv.: 59225-59228/P/00/4c~120615/SM/Perp/09/1c