@staticmethod
def __get_api_link(api):
    """
        returns API links

        :param api: possible values are "wordnik", "glosbe", "urbandict", "bighugelabs"
        :returns: returns API links to urbandictionary, wordnik, glosbe, bighugelabs
        """
    api_name2links = {'wordnik':
        'http://api.wordnik.com/v4/word.json/{word}/{action}?api_key=1e940957819058fe3ec7c59d43c09504b400110db7faa0509'
        , 'glosbe':
        'https://glosbe.com/gapi/translate?from={source_lang}&dest={dest_lang}&format=json&pretty=true&phrase={word}'
        , 'urbandict':
        'http://api.urbandictionary.com/v0/{action}?term={word}',
        'bighugelabs':
        'http://words.bighugelabs.com/api/2/eb4e57bb2c34032da68dfeb3a0578b68/{word}/json'
        }
    return api_name2links.get(api, False)
