APA Style
Worvill, R., Robinson, B. (1973).
A Ladybird Achievements Book : Time, Calendars, and Clocks .
London, UK:
Ladybird.
MLA Style
Worvill, Roy., Robinson, B.H..
"A Ladybird Achievements Book : Time, Calendars, and Clocks".
London, UK:
Ladybird,
1973.
Art Original.