Asian Productivity Organization. (1965). Retirement of Ryota Yamada. Tokyo: Asian Productivity Organization.
शिकागो स्टाइल उद्धरणAsian Productivity Organization. Retirement of Ryota Yamada. Tokyo: Asian Productivity Organization, 1965.
एमएलए उद्धरणAsian Productivity Organization. Retirement of Ryota Yamada. Tokyo: Asian Productivity Organization, 1965.
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