APA
Horsley L., Brownjohn E., .Clever machines. London: ladybird.
Chicago
Horsley Lorraine, Brownjohn Emma, .Clever machines. London: ladybird.
Harvard
Horsley L., Brownjohn E., .Clever machines. London: ladybird.
MLA
Horsley Lorraine, Brownjohn Emma, .London: ladybird. .