Johnson, E. R. (1972). Park resources for recreation. Charles E. Merrill.
芝加哥风格引文Johnson, Elvin R. Park Resources for Recreation. Columbus, Ohio: Charles E. Merrill, 1972.
MLA引文Johnson, Elvin R. Park Resources for Recreation. Charles E. Merrill, 1972.
警告：这些引文格式不一定是100％准确.