APA

riordan j., . (1980). the secret castle. london: macdona Id educational.

Chicago

riordan james, . 1980. the secret castle. london: macdona Id educational.

Harvard

riordan j., . (1980). the secret castle. london: macdona Id educational.

MLA

riordan james, . the secret castle. london: macdona Id educational. 1980.