Babyhood : stage by stage, from birth to age two : how your baby develops physically, emotionally, mentally / Penelope Leach. - 2nd edition, rev. a. expand.. - N.Y. : Alfred A. Knopf, 1995. - xx, 413 p. ; 24 cm.см.. - ბიბლიოგრ.: გვ. 399-407. - ISBN 0-394-71436-9[MFN: 39060]